msem-instigator

Whenever one or more creatures you control attack, you may post a bounty on target creature. (Put a bounty counter on that creature. It has “When this creature dies, each opponent draws a card” as long as it has a bounty counter on it.)

Create a 1/1 colorless Construct artifact creature token. For each other card named Competing Design in your graveyard, create a colorless Canister artifact token with “{T}, Sacrifice this artifact: Add {C}.”

Concord — Highland Hermit gets +1/+1 and has hexproof as long as there are four or more card types among permanents you control.

Defender
Sacrifice two Islands: Deepsea Denizen loses defender until end of turn.

Deathtouch
{B}, Pay 1 life: Add one mana of any color. Activate this ability only once each turn.

{3}, {T}: Tap target creature.

Whenever a creature you control enters, you may have target creature get +1/+1 and gain flying until end of turn.

Lifelink
When Zhehan, the Mediator enters, you may put an Aura card with mana value 3 or less from your hand onto the battlefield attached to a creature it could enchant.

At the beginning of each upkeep, choose one or more —
• Untap target artifact.
• Untap target creature.
• Untap target land.

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.

When Young Chasqui enters, if you cast it, reveal the top five cards of your library. Put any number of creatures named Young Chasqui from among them into your hand. Put the rest of the revealed cards on the bottom of your library in a random order.
A deck can have any number of cards named Young Chasqui.

Creatures you control gain deathtouch until end of turn and must be blocked this turn if able.

Manifest the bottom card of your library. That creature gains lifelink and deathtouch until end of turn. (To manifest a card, put it onto the battlefield face down as a 2/2 creature. Turn it face up any time for its mana cost if it's a creature card.)

You may cast a spell with mana value X or less from your hand without paying its mana cost, where X is the number of lands you control.

Target creature gets +X/+X until end of turn, where X is 3 plus the number of cards named Elemental Power in your graveyard.

When Crinster Tattooist enters, put a +1/+1 counter on each tapped creature you control.

When Bind the Mind enters, each poisoned opponent reveals their hand. Then choose a nonland card name.
Spells with the chosen name can't be cast.

Mossvine Lurker has trample as long as it has a +1/+1 counter on it.

{T}: Add {C}. Activate only if you have less life and control fewer creatures than each opponent.

When Death's Sentry enters, if a creature died this turn, create a 2/2 black Zombie creature token.

Enchant creature
You may cast this spell from your graveyard if it targets a legendary creature you control.
Enchanted creature gets +2/+2 and has haste.

Draw two cards, then discard a card.
Whenever you cast an instant or sorcery spell, if Spirit Script is in your graveyard, you may have it become a copy of that spell until end of turn.

({T}: Add {U}, {R}, or {W}.)
Ancient Dominion enters tapped.

{1}{U}: Return Sparkling Jackalope and target creature to their owner's hands.
{5}{U}{U}: Sparkling Jackalope gets +4/+4 and gains flying until end of turn.

Vision (Whenever this or another creature you control enters, reveal the top card of your library. Then you may put that card into your graveyard.)
Whenever Ulek Windrider envisions an instant or sorcery card, it gets +1/+0 and gains flying until end of turn.