msem-instigator

When Daybreak enters, you gain 3 life.
Creatures can't attack you or planeswalkers you control unless their controller pays {1} for each of those creatures.

Lantern-Bearer Belle gets +2/+0 and has flying as long as you've sacrificed a permanent this turn.

Flash
Enchant player
When Curse of Tempests enters, it deals 3 damage to target creature or planeswalker enchanted player controls.
Whenever enchanted player is attacked, you may draw a card. If you do, discard a card.

Neblus' Legacy enters tapped.
When Neblus' Legacy enters, you may mill two cards.
{T}: Add {G} or {U}.

Once each turn, when a creature you control becomes tapped, you may untap that creature and tap up to one target creature.

Flying
Whenever Haunter of the Deadlands attacks, Spirit creatures you control get +1/+1 until end of turn.

Lifelink, menace

Target creature you control becomes a copy of another target creature you control until end of turn.
Showcase {2}{U}{U} (Then if you cast this for its showcase cost, create a 1/1 red Bard creature token that can't block and exile this. Whenever it attacks, you may cast a free copy of this.)

Up to two target lands you control become 1/1 black Bear creatures with deathtouch. They're still lands. (Then exile this card. You may cast the creature later from exile.)

Choose a nonland card name. Search target player's graveyard, hand, and library for any number of cards with that name and exile them. That player shuffles. For each card exiled from their hand this way, you discard a card.

Flying, haste
Whenever you cast an instant or sorcery spell, create a token that's a copy of Stormcall Thunderbird.

As an additional cost to cast this spell, put a -1/-1 counter on a creature you control.
Search your library for up to two basic land cards, put them onto the battlefield tapped, then shuffle.

Wu Xing (Add effects based on the number of colors of mana spent to cast this spell.)
1 | Attacking creatures get -3/-0 until end of turn.
3 | Thundering Wrath deals 1 damage to each of those creatures.

Ominous Dragoncaller gets +1/+1 and has flying as long as you control a Dragon.

This spell costs {1} less to cast for each card type among cards in your graveyard.
Trample

{B}, Sacrifice another creature: Deranged Apothecary gains indestructible until end of turn.

Choose two —
• Jund Command deals 3 damage to each non-Dragon creature.
• Jund Command deals 4 damage to each opponent.
• Each opponent sacrifices a planeswalker.
• Mill five cards. Return a permanent card milled this way to your hand.

Create three 0/1 green Plant creature tokens.

Enchant land
Whenever enchanted land is tapped for mana, its controller adds {G}.
{G}, Sacrifice Sleeping Dryads: Draw a card.

{X}{U}{U}: Marine Monster can't be blocked by creatures with mana value X or less this turn.

Sacrifice a creature or discard a card: Exile the top card of target player's library. You may cast that card for as long as it remains exiled. Any player may activate this ability but only once each turn and only during their turn.
You and permanents you control have hexproof from spells that were exiled with Mr. Jackston or that share a name with a card exiled with Mr. Jackston.

Experience (Whenever this creature attacks, if it has fewer than three +1/+1 counters on it, put a +1/+1 counter on it.)
When Worried Vulpine has three or more +1/+1 counters on it, remove them all and transform it.

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)

Enchant player
When Curse of the Breathless enters, create a 1/1 white Spirit creature token with flying for each Curse attached to enchanted player.
Whenever another Curse becomes attached to enchanted player, create a 1/1 white Spirit creature token with flying.

As long as you control four or more lands, Seeker of Untouched Beauty gets +2/+2 and has trample.
When Seeker of Untouched Beauty dies, you may search your library for a basic land card, put it onto the battlefield tapped, then shuffle.