Harvest (You may tap any number of creatures you control as you cast this spell. If you do, reduce this spell's mana cost by their total power.) Search your library for a basic land card, put it onto the battlefield tapped, then shuffle. You gain 3 life.
Whenever a permanent with one or more counters on it is put into your graveyard from the battlefield, it deals that much damage to any target and you gain that much life.
Whenever a nontoken creature you control dies, create a 1/1 black Worm creature token. Sacrifice Fertile Grave: Create a 1/1 black Worm creature token.
Search your library for a basic land card, put it onto the battlefield tapped, then shuffle. Kindle 2—{2}{G}({2}{G}, Exile this card from your graveyard: Create two 1/1 colorless Elemental creature tokens. Kindle only as a sorcery.)
{1}, {T}, Move a -1/-1 counter from another creature onto Fervent Arbiter: Exile target creature you don't control until Fervent Arbiter leaves the battlefield.
Menace When Fervent Devout enters, choose one — • Put a +1/+1 counter on Fervent Devout. • Create a colorless artifact token named Lotus Petal with “{T}, Sacrifice this artifact: Add one mana of any color.”
Flying You may exert Fervent Igmel as it attacks. When you do, add {R}{R}{R}{R}. Until end of turn, you don't lose this mana as steps and phases end. (An exerted creature won't untap during your next untap step.)
Whenever a creature you control dies, put a rot counter on Fester Swarm and you gain 1 life. {B}{G}, Remove two or more rot counters from Fester Swarm: Create a 1/1 green Insect creature token, then put a +1/+1 counter on it for each rot counter removed this way.
When Festering Shipwreck enters, create a Vial token. (It's an artifact with “{1}, Sacrifice this and another permanent: Draw a card. Activate only during your turn.”) At the beginning of each player's upkeep, that player sacrifices a nonland permanent.
When Festering Waif enters, each opponent mills two cards. Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)
Golden age (If you cast an instant or sorcery spell, activated a nonmana ability, and attacked this turn, enter a renaissance for this game.) {T}: Add {C}. If you're in a renaissance, add one mana of any color instead. {3}, {T}: Scry 1.
When Festival Rioters enters, create a colorless artifact token named Lotus Petal with “{T}, Sacrifice this artifact: Add one mana of any color.” {1}{R}: Festival Rioters gets +2/+0 until end of turn.
Choose one — • Festival Sabotage deals 2 damage to any target. • Audition for red. (Create a 1/1 Construct Actor creature token, a Warrior Role giving 3/2 and trample, or a Wizard Role giving 2/2 and prowess. Roles replace older ones.)