msem-instigator

Flying, first strike
If one or more tokens would be created under your control, those tokens plus a 1/1 black and red Vampire creature token with menace are created instead.
{3}{B}{B}: Each opponent loses X life and you gain X life, where X is the number of Vampires you control.

Menace
Inspired — Whenever Soul Engulfer becomes untapped, each opponent loses 4 life.

Flying
When Greater Swooprat enters, creatures your opponents control get -1/-1 until end of turn.

Enchant opponent
At the beginning of enchanted player's end step, they discard a card.

Haste
When Vidal enters, reveal cards from the top of your library until you reveal an enchantment card with mana value 3 or less. Put that card onto the battlefield and the rest on the bottom of your library in a random order. Sacrifice that enchantment at the beginning of the next end step.

This spell costs {1} less to cast for each instant and sorcery card in your graveyard.
[+1]: Create a 2/2 blue Elemental Illusion creature token with flying and “Whenever this becomes the target of a spell, sacrifice it.”
[–3]: Return up to one other target nonland permanent to its owner's hand. Draw a card.

Enchant creature you control
When Rise of Heroes enters or enchanted creature dies, search your library for a creature or planeswalker card with mana value 3 or less, reveal it, put it into your hand, then shuffle.
Enchanted creature gets +1/+1 for each creature and/or planeswalker you control.

When Smashing Brute enters, target nonbasic permanent loses all abilities until your next turn.
Foresight — Whenever you draw your second card each turn, you may exile Smashing Brute. If you do, return it to the battlefield.

Mill five cards. Return any number of cards with cycling abilities milled this way to your hand.
Cycling {2} ({2}, Discard this card: Draw a card.)

Target creature you control gets +2/+2 until end of turn. It fights target creature an opponent controls.

Untap up to two permanents you control during each other player's untap step.

Bloodthirst 1 (If an opponent was dealt damage this turn, this creature enters with a +1/+1 counter on it.)
Haste
Whenever you cast a creature spell, it gains bloodthirst 1. (Multiple instances of bloodthirst on a spell stack.)

At the beginning of your end step, you may sacrifice a permanent. When you do, return target creature card from your graveyard to your hand.

Flying, lifelink
Your opponents can't search libraries.
{B}, Pay 2 life, Discard a card: Search your library for a card, then shuffle and put that card on top.

{4}{G}: Battle Station gets +3/+3 until end of turn.
Cycling {2/G} ({2/G}, Discard this card: Draw a card.)

Creatures you control get +1/+1 until end of turn. Enchantment creatures you control gain vigilance until end of turn.
Flashback {4}{W} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Target creature can't be blocked this turn.
Proliferate. (Choose any number of permanents and/or players with counters on them, then give each another counter of each kind already there.)

Target creature gets +2/+0 and gains first strike until end of turn. If it's a Dragon, put a +1/+1 counter on it.

Enchant creature
Enchanted creature has “{R}, {T}: Create an X/1 red Elemental creature token with haste and trample, where X is this creature's power. Exile that token at the beginning of the next end step.”

Defender, reach

Ward—Pay 2 life.
Whenever another creature dies, put a hysteria counter on Mob of the End.
At the beginning of your first main phase, remove all hysteria counters from Mob of the End and add that much {R}.

Vigilance
When Tamaak Confidant enters, you gain 6 life if you control three or more Satrapies.

Whenever you cast a spell with mana value 4 or greater, create a Treasure token. If that spell's mana value is 6 or greater, draw a card. If that spell's mana value is 8 or greater, Main Role Maiden deals 4 damage to each creature and planeswalker you don't control.

Kicker {W} (You may pay an additional {W} as you cast this spell.)
Target player sacrifices an attacking creature. If this spell was kicked, you gain life equal to the sacrificed creature's power.

Create a 1/1 white Citizen creature token. If you control a different permanent of each of three colors, create three of those tokens instead. Whenever a land you control enters this turn, repeat that process.