msem-instigator

Prowess
When Grasper of Secrets enters, choose one —
• Return target creature to its owner's hand.
• Return target instant or sorcery card from your graveyard to your hand.
Evoke {2}{U} (You may cast this spell for its evoke cost. If you do, it's sacrificed when it enters.)

Flash
When Zhedina Coastguard enters, you may have any number of creatures you control have base power and toughness 1/3, 2/2, or 3/1 until end of turn.

Chronicle (As this enters and after your draw step, add a lore counter. Stop after III.)
[Lore I-II] Purphoros's Gemback deals 1 damage to target player or planeswalker.
[Lore III] Create a Treasure token. (It's an artifact with “{T}, Sacrifice this artifact: Add one mana of any color.”)

Haste
Whenever a creature dealt combat damage by Cutthroat Carnie this turn dies, you may have Cutthroat Carnie fight target creature.

When Herald of Teardrops enters, choose one. If you control another Elemental, you may choose both instead.
• Create a 1/1 blue Elemental creature token with flying.
• Put a +1/+1 counter on each of up to two creatures.

Destroy target enchantment. Put a +1/+1 counter on target creature you control.

Bloodprice—Reappropriate red. (You may cast this spell by sacrificing a creature and exiling two red cards from your hand and/or graveyard.)
Haste
Whenever Creed's Desperado attacks, if defending player has more cards in hand than you, exile the top card of that player's library. You may cast it as long as you control a Warrior, and you may spend mana as though it were mana of any color to cast it.

Trample

Equipped creature gets +1/+0 and has “Whenever this creature deals damage to a player or planeswalker, you may draw two cards. If you do, discard a card.”
Equip {2}

At the beginning of combat on your turn, if you control a creature with power greater than Ever-Gnawing Rat's, put a +1/+1 counter on Ever-Gnawing Rat.

Flying
Whenever a creature enters under an opponent's control, you may pay {1}{B}. If you do, fateseal 1. (Look at the top one cards of an opponent's library, then put any number on the bottom and the rest on top in any order.)

Poisonous 2 (Whenever this creature deals combat damage to a player, that player gets two poison counters.)
{2}{B}: Choose a counter on target permanent or player. Give that permanent or player another counter of that kind.

Look at the top three cards of your library. Put one of those cards into your hand, one on top of your library, and one on the bottom of your library.

Once each turn, when you sacrifice a land, you may add one mana of any color. Until end of turn, you don't lose this mana as steps and phases end.

Fierce Contempt deals 6 damage to target creature.

Creatures with power greater than Deformed Vagrant's power can't block it.

Paradise Windows enters tapped.
{T}: Add {G} or {W}.
{G}{W}, {T}, Sacrifice Paradise Windows: Conjure a card named Data-Point into your hand. (It's a sorcery that costs {2} with “Draw a card.”)

Molten Mire enters tapped unless you control a basic land.
{T}: Add {B} or {R}.

Until end of turn, target creature gets +2/+0 and gains “When this creature dies, return it to the battlefield tapped under your control.”

When Prodigious Telemancer enters, you may draw a card, then discard a card.
Whenever you cast an instant or sorcery spell, you may aetherize target creature you control. (To aetherize, create a token that's a copy of it, then exile that token.)

Whenever an enchantment you control enters, choose one that hasn't been chosen this turn —
• Draw a card.
• Put two +1/+1 counters on target creature you control.

Dominik's Shack enters tapped.
When Dominik's Shack enters, you may mill two cards.
{T}: Add {B} or {G}.

Defender
As long as your fealty to Islands is six or greater, Oasis Glutton can attack as though it didn't have defender. (Each Island you control counts towards your fealty to Islands.)

You may exile cards you own as you reveal them. (You see the card before you exile it.)
During each of your turns, you may cast a card exiled with Starwing Nebula.

Doom deals 3 damage to any target and you gain 3 life.
Reconstruct {3}{B}{B} (You may cast this from your graveyard for its reconstruct cost reduced by the mana value of a permanent you sacrifice as you cast it this way. Then exile this.)
You may cast Doom from exile by paying {4}{B}{B}{B} rather than its mana cost. If you do, shuffle it into your library instead of putting it anywhere else as it resolves.