msem-instigator

Flying
Whenever you foretell a card or cast a foretold spell, each opponent loses 3 life unless they sacrifice a creature or discard a card.

Flying
Whenever Prismatic Scyphozoa attacks or blocks, target player mills three cards.
When Prismatic Scyphozoa dies, create four 1/1 blue Elemental creature tokens with flying.

Return target creature you control and target creature you don't control to their owners' hands. Target player discards a card.
Coalesce {4}{U}{B} (You may cast this from your graveyard for {4}{U}{B}. If you do, it enters as a Horror creature after it resolves. Exile it if it would leave the battlefield or not resolve.)
Terrors of Cuxuri Trench can't block.

Menace
Whenever one or more cards leave your graveyard or Watchers of the Veil leaves your graveyard, you may draw a card. If you do, discard a card.

When Wretched Spawn enters, you may return target permanent to its owner's hand. If you do, that player discards a card.
Unearth {4}{U}{B} ({4}{U}{B}: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the end step or if it would leave the battlefield. Unearth only as a sorcery.)

Abyss Howler must be blocked if able.
Whenever Abyss Howler becomes blocked, defending player loses 2 life and you gain 2 life.

Flying
{1}, Sacrifice a creature: Put a +1/+1 counter on Bloodthirsty Manticore. It gains indestructible until end of turn. Tap it.
Surpass {4}{B}{R} ({4}{B}{R}: Transform this creature. This costs {1} less to activate for each counter on it. Activate only as a sorcery.)

{1}, Sacrifice a creature: Create a Treasure token. Exile the top card of your library. You may play that card this turn.

Flying
When Kaalia's Abomination enters or dies, it deals 2 damage to target opponent. Then that player discards two cards.

Bleed {1}{B}{R} (You may cast this spell for its bleed cost if an opponent has lost life this turn.)
At the beginning of each end step, if an opponent lost life this turn, draw two cards, then discard a card at random.

Glorious end — When Toros the Warchief dies, if it was tapped, return it to the battlefield at the beginning of the next end step.
Attacking creatures you control have deathtouch.

Flying, haste
Whenever another creature dies, Twinfire Dragon gets +1/+0 until end of turn.

{T}: Return target creature card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. That creature salvages a card. (Exile one from your graveyard until that creature leaves the battlefield. Whenever that creature deals combat damage to a player, put a card it salvaged into your hand.)

Trample
When Wasteland Ravagers enters, you may sacrifice a land or exile a land card from your graveyard. If you do, creatures you control get +1/+0 and gain haste until end of turn.

Trample
Auspicious Qilin must be blocked if able.

Whenever a land you control enters, add one mana of any color.
Whenever Enraged Fangwurm attacks, you may sacrifice a land. If you do, Enraged Fangwurm deals 2 damage to target player or planeswalker.

Whenever Glorybound Chorister attacks, put a +1/+1 counter on each other attacking creature you control.

Flying, trample
At the beginning of combat on your turn, goad all creatures with power 3 or less. (Until your next turn, that creature attacks each combat if able and attacks a player other than you if able.)
Whenever a creature deals combat damage to an opponent, put a +1/+1 counter on it.

Trample
{2}{R}{G}: Creatures you control get +1/+1 until end of turn.

This spell costs {X} less to cast, where X is the greatest power among creatures you control.
{1}{R}{G}: Warriors you control get +1/+0 and gain trample until end of turn.

Trample
Creatures in Paomar Primus's pack can't be blocked by more than one creature. (Two or more creatures you control with equal power are in a pack.)

Menagerie — When Paw Valley Alpha enters, if there are five or more creature types among creatures you control, you may destroy target artifact or enchantment.

Flying
When Scorchpass Sovereign enters, it deals 1 damage to each creature with flying you don't control.

Whenever Seeker of Battle attacks, put a +1/+1 counter on each creature you control. Those creatures gain trample until end of turn.

Assault {2}{R}{G} (Whenever this attacks, if it has no +1/+1 counters on it, you may pay its assault cost to put a +1/+1 counter on it.)
When Shemesh assaults, other creatures you control get +2/+2 and gain trample until end of turn.