msem-instigator

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.”)

At the beginning of combat on your turn, target creature you control explores three times. It attacks this combat if able and other creatures you control can't attack this combat. (Reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a +1/+1 counter on that creature, then put the card back or put it into your graveyard.)

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.

{R}, {T}, Exert Provoker of Mountains: Create an X/X red Elemental creature token, where X is the number of spells you've cast this turn. (An exerted creature won't untap during your next untap step.)
{X}{X}{R}, {T}, Sacrifice Provoker of Mountains: Provoker of Mountains deals X damage to any target.

Whenever you cast a noncreature spell, Prowling Frost-Tiger gets +1/+1 and gains hexproof until end of turn.

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.”)

As long as your deck contains only green and colorless cards, your minimum deck size is reduced by eight.

Target player can't cast spells this turn.
Fabled {2}{W}{U} (Then if you cast this for its fabled cost, put it onto the battlefield transformed attached to that player.)

As Publishing Press enters, you may exile a nonland card with mana value 2 or less from your hand.
At the beginning of your upkeep, you may cast a copy of the exiled card without paying its mana cost if the spell's mana value is 2 or less.

Put target nonland permanent on the bottom of its owner's library. You gain life equal to the number of poison counters its owner has.

Destroy all creatures that aren't enchanted or equipped.

This spell costs {3} less to cast if a creature died this turn.
Put target creature card with mana value X from a graveyard onto the battlefield under your control.

Enchant creature
{U}: Tap enchanted creature.
{1}{U}: Untap enchanted creature and gain control of it until end of turn.

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.

{1}{G}: Purge. If you do, put a +1/+1 counter on Purging Watchwarden and you gain 2 life. (To purge, exile two cards that share a type from graveyards. If you do, draw a card.)

At the beginning of your end step, you get a perfection counter. Create a token that's a copy of up to one other target creature you control, then exile that token unless you have six or more perfection counters.

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.)

{T}: Pyrespike Familiar deals 1 damage to target player or planeswalker.
Menagerie — As long as there are five or more creature types among creatures you control, if a red source you control would deal damage, it deals that much damage plus 1 instead.

Mill three cards. Pyromancer's Fury deals damage to any target equal to the number of instant and sorcery cards in your graveyard.

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

Pyrostorm deals 10 damage divided as you choose among any number of targets.

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.

Archive 5 (As this enters, shuffle the top five cards of your main library into a new face up library. Sacrifice this after the archived library is empty.)
At the beginning of each upkeep, exile the top card of the archived library and your main library. You may cast those cards this turn and may spend mana as though it were mana of any color to cast them.