msem-instigator

Look at the top two cards of your library. Put one of them into your hand and the other into your graveyard.
Flashback {2}{U} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Persistent glitch {1}. Spend only mana of a color that hasn't been spent this way to activate this ability. ({1}: Permanently remove one [restriction] from this permanent.)
[+1]: You [and each opponent] may scry 2. Draw a card[, then discard a card.]
[–3]: Exile target nonland permanent [with mana value 4 or less]. [Its controller creates a Treasure token.]
[–6]: Create five 2/2 blue Elemental creature tokens with flying [and -1/-1 counters on them].

Haste
Encourage ({T}: Another target creature you control gets +1/+1 until end of turn. Encourage only as a sorcery.)

Target creature gets +2/+2 until end of turn. You gain 2 life.

Concord — When Gold Pelt Responders enters the battlefield, if there are four or more card types among permanents you control, you may exile target nonland permanent an opponent controls with mana value 4 or less until Gold Pelt Responders leaves the battlefield.

At the beginning of your upkeep, create a Treasure token. Then if you control fifteen or more artifacts, creatures, and/or enchantments, you win the game. (Treasure tokens are artifacts with “{T}, Sacrifice this artifact: Add one mana of any color.”)

Flying
When Graceful Yuroda enters the battlefield, return target permanent you control to its owner's hand.

When Graide, Voice of Autumn enters the battlefield, create X 1/1 green Squirrel creature tokens.
Squirrels you control get +1/+0 and have haste.
Nonbasic lands your opponents control enter the battlefield tapped.

Mill three cards, then you may return a creature or land card from your graveyard to your hand. (To mill three cards, put the top three cards of your library into your graveyard.)

Griffin Country enters the battlefield with a feather counter on it.
Creatures with flying you control get +1/+1.
{U}, Remove a feather counter from Griffin Country: Put a flying counter on target creature you control.
{2}{U}, Remove a feather counter from Griffin Country: Search your library for a creature card with flying, reveal it, put it into your hand, then shuffle.

Deception {2}{B} ({2}{B}, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.)
Whenever Grinning Torturer deals combat damage to a player, torment that player. (They lose 3 life unless they discard a card or sacrifice a nonland permanent.)

Enchant land
Enchanted land has “{T}: Tap target creature.”

When Hamlet Bounder enters the battlefield, choose one —
• Destroy target artifact or enchantment.
• Create a 1/1 white Peasant creature token.

Indestructible
Whenever Hannaru the Conqueror attacks, put a +1/+1 counter on each creature you control.

Enchant creature
When Hannaru's Courage enters the battlefield, create a 1/1 white Soldier creature token with vigilance.
Enchanted creature gets +1/+1 and has vigilance.

When Hannaru's Spear enters the battlefield, create Hannaru's Aegis, a legendary white Equipment artifact token with “Equipped creature gets +1/+2 and has vigilance” and equip {2}.
Equipped creature gets +2/+1 and has first strike.
Equip {2}

Flying
Assault {2}{B} (Whenever this attacks, if it has no +1/+1 counters on it, you may pay its assault cost to put a +1/+1 counter on it.)
When Harbinger of Locusts assaults, you may search your library for an Insect card, reveal it, put it into your hand, then shuffle.

Civilized — Hard-Working Oxen gets +3/+0 as long as you control an artifact, a creature, and an enchantment.

Trample
Other Dwarves and Elves you control get +1/+1.
If Harl and Finn or another Dwarf or Elf you control entering the battlefield or attacking causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time.

When Harpooned Bubbledomer enters the battlefield, mill four cards.
Harpooned Bubbledomer gets +2/+0 and has menace as long as there are four or more card types among cards in your graveyard.

As an additional cost to cast this spell, sacrifice a land.
Search your library for up to two basic land cards, put them onto the battlefield, then shuffle.

When Harshapal Banner enters the battlefield, create three 1/1 white Soldier creature tokens with vigilance.
Equipped creature gets +2/+2.
Equip {3}

When Harvest Blighter enters the battlefield, create a black Aura Curse enchantment token named Rotting Away attached to target player. The token has enchant player and “Whenever a creature enters the battlefield under enchanted player's control, if it has toughness 2 or greater, put a -1/-1 counter on that creature.”

Harvest (You may tap any number of creatures you control as you cast this spell. If you do, reduce this spell's mana cost by their total power.)
Create a 5/5 colorless Scarecrow artifact creature token with “This creature can't block or harvest.”
Flashback {8}{R} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Reprise {3}{R} (As you cast an instant or sorcery spell, you may exile one card with reprise from your graveyard and pay its reprise cost. If you do, add its effects to that spell.)
Hatsuo's Maneuver deals 1 damage to any target. Create a number of 1/1 red Warrior creature tokens equal to the damage dealt by this spell.