msem-instigator

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
{U}{R}: Target creature without prowess gains prowess until end of turn. Activate only if Intelligence is in your graveyard.

As long as it's your turn, Ahl the Omenwing is a 2/1 Bird Wizard creature with flying and indestructible. (He doesn't lose loyalty while he's not a planeswalker.)
[+1]: Surveil X, where X is the number of creatures that attacked this turn.
[–2]: Return target nonland permanent to its owner's hand. Draw a card.

Combined Generator can't be blocked except by three or more creatures.

Gain control of target nonland permanent you don't control unless its controller has Bow or Burn deal X damage to them, where X is twice that permanent's mana value. If Bow or Burn was cast from a graveyard, repeat this process for each other nonland permanent they control.
Flashback {6}{R}{R}

Creatures with power less than or equal to the number of creatures in Wildershrine Elder's pack can't block it. (Two or more creatures you control with equal power are in a pack.)

Exile a creature card from your graveyard: Put two loyalty counters on Corpus. Activate only as a sorcery and only once each turn.
[–2]: You may sacrifice a creature. If you do, create a 4/4 red Horror creature token with menace. Otherwise, create a 2/2 black Zombie creature token.
[–4]: Search your library for two non-Corpus cards and reveal them. Put one into your hand and the other into your graveyard, then shuffle.

Long-Lived Prowler gets +3/+0 as long as there are four or more card types among cards in your graveyard.

Mentor (Whenever this creature attacks, put a +1/+1 counter on target attacking creature with lesser power.)
Whenever Master of Ancient Ways mentors a creature, that creature gains double strike until end of turn.

At the beginning of your upkeep, mill a card.
Whenever you cast a spell from your graveyard, create a 2/2 green Wolf creature token.

Target creature gets -3/-3 until end of turn. Scry 2.

Artifact vision (Whenever this or another artifact you control enters, reveal the top card of your library. Then you may put that card into your graveyard.)
Whenever Mechanomind Researcher envisions an artifact card, put a +1/+1 counter on it.

Trample
Heretic (Whenever you cast a spell that doesn't share a color with this creature, it gets +1/+1 until end of turn.)

Deathtouch
Whenever a creature you control with deathtouch deals damage to an opponent, that player creates a black enchantment token named Blight with “At the beginning of your upkeep, you lose 1 life.”

Wandering Megaflora has hexproof as long as it's untapped.
Whenever Wandering Megaflora attacks, untap another target creature you control.

Wanderlust — When Riftbreaker Mage dies, if you control four or more differently named lands, Riftbreaker Mage deals damage equal to its power to each opponent.

Oshiruko Whisperwalker can't be blocked except by Rogues.
Whenever a creature is returned to its owner's hand, you may draw a card. If you do, discard a card.

Draw three cards.
Reprise {5}{U}{U} (As you cast an instant or sorcery spell, you may exile one card with reprise from your graveyard and pay its reprise cost. If you do, add its effects to that spell.)

Whenever a creature you control dies, you may return all cards that were inscribed onto that creature and all Auras that were attached to that creature to their owners' hands.

{T}: Add {C}.
{T}, Reappropriate: Add {B} or {R}. (To reappropriate, exile exactly two cards from your hand and/or graveyard.)

Flash
When Remnant Spotter enters, put target permanent card from your graveyard on top of your library.

As an additional cost to cast this spell, remove X +1/+1 counters from among creatures you control.
Create X 2/2 green Wolf creature tokens.

Other Foxes you control get +1/+1.
{2}{W}: Target Fox you control gains lifelink until end of turn.

Create an X/X green Mutant creature token, where X is the greatest power among creatures you've controlled this turn. If you control a creature with flying, the token has flying. The same is true for first strike, double strike, deathtouch, hexproof, haste, indestructible, lifelink, menace, reach, trample, and vigilance.

Choose one —
• Destroy target artifact or enchantment.
• Search your library for up to two basic land cards, reveal them, put them into your hand, then shuffle.

Prowess
Whenever you cast a noncreature spell, create a 3/3 red Dragon creature token with flying.