msem-instigator

Scavenger Holdout enters tapped.
When Scavenger Holdout enters, you may pay {3}. If you do, create two 1/1 green Scout creature tokens.
{T}: Add {C}.

Manifest the top card of your library and the bottom card of your library. (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.)

Trample
When Magmatic Ravager enters, two target lands you control don't untap during your next untap step.

When Sunwright Scion enters, put a +1/+1 counter on each other creature you control.
At the beginning of each combat, you may have target creature with a +1/+1 counter on it gain your choice of vigilance, lifelink, or trample until end of turn.

Prowess
{3}{R}, Sacrifice Goblin Experimenter: Return target sorcery card from your graveyard to your hand.

At the beginning of each upkeep you may pay {W}. If you do, tap target creature.

When Feverish Noble dies, you draw two cards and you lose 2 life.

Choose one —
• Dispersive Volley deals 1 damage to each of up to three target attacking or blocking creatures.
• Target player sacrifices an enchantment.

Deathtouch
The first instant or sorcery spell with mana value 3 or less you cast each turn has siphon. (Each -1/-1 counter you put on your creatures up to their remaining toughness while casting this pays for {1}.)

Choose one —
• Exile target artifact.
• Exile target creature with flying.
• Exile target card in a graveyard.

As Rhythm of Avaz enters, choose Cyrukan or Sahra.
• Cyrukan — At the beginning of combat on your turn, put a +1/+1 counter on target creature you control.
• Sahra — Creatures you control have menace and haste, and attack each combat if able.

Destroy target creature. Create a tapped 2/2 black Zombie creature token.

Flying, lifelink
Whenever a creature you control dies, Vindictive Regent gets +1/+1 until end of turn.
At the beginning of your end step, if you gained 3 or more life this turn, each opponent sacrifices a creature.

{T}: Add {B}.
{B}, {T}: Target creature gains menace until end of turn.

Whenever Ancient Durumderm attacks, you may return another creature you control to its owner's hand. If you do, create a Treasure token. (It's an artifact with “{T}, Sacrifice this artifact: Add one mana of any color.”)

For each counter on each permanent you control, you may put another counter of that kind on that permanent.
Draw a card.

Whenever Fickle Feeder blocks, fateseal 1. (To fateseal 1, look at the top card of an opponent's library, then you may put it on the bottom of that player's library.)

At the beginning of your end step, if a permanent was put into your graveyard from the battlefield this turn, put a +1/+1 counter on Vulture Corps.

{T}: Add one mana of any color.
{3}, {T}, Sacrifice Coveted Heirloom: Draw a card.
Tap three untapped artifacts you control: Return Coveted Heirloom from your graveyard to the battlefield.

This spell costs {1} less to cast for each artifact you control.
Gain control of target creature until end of turn. Untap that creature. It gains menace and haste until end of turn.

Flash
When Thornweald Cavalier enters, target creature gets +1/+1 until end of turn. Put a reach counter on it.

When Warden of the Dead enters, you draw a card and you lose 1 life.
When Warden of the Dead dies, conjure three cards named Warden of the Dead and shuffle them into your main library. For the rest of the game, you may cast spells named Warden of the Dead without paying their mana costs.

You may have Urushi, the Ripple in the Smoke enter as a copy of any creature on the battlefield, except it's an enchantment. (It's not a creature.)

Siphon (Each -1/-1 counter you put on your creatures up to their remaining toughness while casting this pays for {1}.)
Target creature gets +2/+2 and gains indestructible until end of turn.

Equipped creature gets +3/+2.
Equip enchantment creature {1}
Equip artifact creature {2}
Equip {3}