msem-instigator

When Alchemist's Kit enters, you may return target creature to its owner's hand.
2U, Sacrifice Alchemist's Kit: Draw a card.

{U}, Put a travel counter on Endless Discoveries: Draw a card. This ability costs {1} more to activate for each travel counter on Endless Discoveries.
{3}{U}{U}, Sacrifice Endless Discoveries: Return target instant or sorcery card with mana value less than or equal to the number of travel counters on Endless Discoveries from your graveyard to your hand.

When this creature enters, you may return another target creature you control to its owner's hand. If you do, create a Treasure token.

If casting this spell causes a triggered ability of its target to trigger, that ability triggers an additional time.
Target creature gains first strike until end of turn.

When Seafloor Casket enters and when you sacrifice it, target player mills two cards.
{1}{U}, Sacrifice Seafloor Casket: Draw a card.
Cycling {2} ({2}, Discard this card: Draw a card.)

Inspired — Whenever Emperor Dan Te Mogui becomes untapped, look at the top three cards of your library. Put one into your graveyard, one on the bottom of your library, and one on top.
When Emperor Dan Te Mogui dies, you may put it on the bottom of your library. If you do, return target permanent card from your graveyard to your hand.

At the beginning of your upkeep, put a +1/+1 counter on Kaur's Gift, then you gain life and add {G} equal to its power. You don't lose that mana as steps, phases, and turns end.
When Kaur's Gift dies, you gain life and add {G} equal to its power. You don't lose that mana as steps, phases, and turns end.

Whenever an opponent draws a card except during their draw step, adjudicate. (Create a white Aura enchantment token with enchant creature and “Sacrifice this token: Untap enchanted creature” attached to target creature.)
Whenever an enchanted creature you control deals combat damage to a player, draw a card.

When Snagged Truck enters, investigate three times. (Create three colorless Clue artifact tokens with “{2}, Sacrifice this: Draw a card.”)
Snagged Truck can't attack or block as long as you control a Clue.
Crew 2 (Tap any number of creatures you control with total power 2 or greater: This Vehicle becomes an artifact creature until end of turn.)

Voracious 2 (As this enters, you may sacrifice up to two artifacts and/or creatures. This creature enters with that many +1/+1 counters on it.)
When Hunted Wolf enters, create a 2/2 black Soldier creature token.

Put X +1/+1 counters on target creature you control. It deals damage equal to its power to up to one target creature or planeswalker you don't control. If that creature or planeswalker would die this turn, exile it instead.

Haste
Ruin Shark attacks each turn if able.
Ruin Shark gets +1/+0 and has first strike as long as you've drawn two or more cards this turn.

Haste
Melee (Whenever this creature attacks, it gets +1/+1 until end of turn for each opponent you attacked this combat.)
Legendary creatures you control have haste.

Any number of target players mill twice X cards, where X is the number of artifacts and enchantments you control. Then you may cast a nonland card with mana value X or less from a graveyard without paying its mana cost. You can't cast more spells this turn.

Whenever Memory of Fatalism dies or you cast a noncreature spell, each opponent loses 2 life and you gain 2 life.
{4}: Put Memory of Fatalism from your graveyard on top of your library.

Whenever you put one or more -1/-1 counters on a creature, put that many charge counters on Cycle of Scars.
Remove three charge counters from Cycle of Scars: Copy target instant or sorcery spell you control. You may choose new targets for the copy.

When Troubled Heir dies, create a tapped Plains token.

Your opponents play with their hands revealed.

Enchant creature
When Mystic's Mantle enters, draw a card.
Enchanted creature gets +1/+1.
Mirage {G} (You may cast this spell as though it had flash for its mirage cost. If you do, sacrifice it at the beginning of the next cleanup step.)

Whenever you cast a noncreature spell, target player mills two cards.
{U}: This creature gets +1/-1 until end of turn.

When Poisonblade Herald enters, put a -1/-1 counter on a creature you control.

Equipped creature gets +2/+2.
Whenever equipped creature attacks, the next time an instant or sorcery source you control would deal damage to a creature, player, or planeswalker this turn, it deals that much damage plus 2 instead.
Equip {2}

Flash (You may cast this spell any time you could cast an instant.)
When Spell Shackle enters, exile target instant or sorcery spell. (That spell won't resolve.)
{1}{U}, Sacrifice Spell Shackle: Cast the exiled card without paying its mana cost.

Vigilance
Assault {G} (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.)

Lifelink
{1}{G}{U}: Put a +1/+1 counter on Advocate of Ideals. Until end of turn, it becomes an Angel in addition to its other types and gains flying and vigilance.