msem-instigator

You may play Promethean Grotto from your graveyard.
{T}: Add {C}.
Cycling {2} ({2}, Discard this card: Draw a card.)

Flying
Whenever a creature you control attacks alone, choose one —
• Exile target creature with power less than that creature's power.
• Put two +1/+1 counters on that creature.
• That creature gains first strike and lifelink until end of turn. Untap it.

Whenever you cast a spell from exile, Promised Seeker gets +3/+3 until end of turn.
Prophecy {G} (Once each turn, you may exile a card with prophecy as you reveal it. When you do, you may cast it for its prophecy cost as long as it's exiled.)

Whenever equipped creature deals combat damage to a player, put a +1/+1 counter on it, then proliferate. (You choose any number of permanents and/or players with counters on them, then give each another kind of a counter already there.)
Equip {2}

Enchant creature
Enchanted creature can't attack or block.
Foresee — As you draw Prophecy of Peace, you may reveal it and pay {W}. When you do, target creature can't attack or block this turn.

When Prophetic Prism enters, draw a card.
{1}, {T}: Add one mana of any color.

Flying
Experience (Whenever this creature attacks, if it has fewer than three +1/+1 counters on it, put a +1/+1 counter on it.)
Other creatures you control get +1/+1 for each +1/+1 counter on Protector of the League.

Sacrifice Proud Lion: Counter target spell that targets you.
Ride {1}{W} ({1}{W}: Transform this and attach it to target creature you control without a Steed. Ride only as a sorcery.)

Choose two or four —
• Prove Worthy has lifelink and can't be countered.
• Prove Worthy deals 3 damage to target player or planeswalker.
• Prove Worthy deals 3 damage to target creature or planeswalker.
• Conjure a card named Fatigue and put it on top of your library. (It's a colorless sorcery that costs {2} with “Draw a card.”)

As an additional cost to cast this spell, pay any amount of life.
Search your library for a card. If you have 10 or less life, search your library for two cards instead. Put those cards into your hand, then shuffle.

Target player reveals their hand. You choose a nonland card from it. That player discards that card. You lose 1 life.
Investigate. (Create a colorless Clue artifact token with “{2}, Sacrifice this artifact: Draw a card.”)

Defender (This creature can't attack.)
Whenever you cast a spell during an opponent's turn, scry 1. (To scry 1, look at the top card of your library. You may put that card on the bottom of your library.)

Scry 1, then draw a card.
Acquiesce (If you cast this spell from your hand, exile it as it resolves. When one or more creatures you control deal combat damage to an opponent, you may cast this card from exile without paying its mana cost.)

Destroy all creatures that aren't enchanted or equipped.

Haste
Whenever you cast an instant or sorcery spell, Pupil of Lightning gets +1/+1 until end of turn. If you cast that spell from your graveyard, put a +1/+1 counter on it instead.

Choose one —
• Purging Light deals 3 damage to target attacking or blocking creature. If that creature would die this turn, exile it instead.
• Exile target enchantment.

This spell costs {1} less to cast if it targets a creature with power 3 or less.
Destroy target attacking or blocking creature.

Deathtouch
Putrid Lurker can't block.
Whenever you discard Putrid Lurker or another card, you may pay {B}. If you do, return Putrid Lurker from your graveyard to the battlefield.

Flash
When Pyramid Lord enters, copy target instant or sorcery spell. You may choose new targets for the copy.
Mirage {1}{R}{R} (You may cast this spell for its mirage cost. If you do, sacrifice it at the beginning of the next cleanup step.)

Choose one —
• Target creature gets +4/+2 until end of turn.
• Pyromantic Expertise deals 4 damage to target creature or planeswalker.

Flying, haste
Whenever Pyrus, the Undying Flame attacks, add {R}{R}{R}{R}. You don't lose this mana as steps, phases, and turns end.
{1}{R}: Pyrus gets +1/+0 until end of turn.

You may change any targets of target spell that targets you or a permanent you control. If you don't, counter that spell.

Choose one —
• Qi-Long Gust deals 3 damage to any target.
• You and permanents you control gain hexproof until end of turn.

Vision (Whenever this or another creature you control enters, reveal the top card of your library. Then you may put that card into your graveyard.)
Whenever Qilan Seer envisions a creature card, it gets +4/+0 until end of turn.

Haste
When Qilan Stormers enters, it gets +X/+0 until end of turn, where X is the number of creatures you control.