Plague Boiler

At the beginning of your upkeep, put a plague counter on Plague Boiler.
: Put a plague counter on Plague Boiler or remove a plague counter from it.
When Plague Boiler has three or more plague counters on it, sacrifice it. If you do, destroy all nonland permanents.

Lava Spike

Lava Spike deals 3 damage to target player or planeswalker.

Terashi’s Grasp

Destroy target artifact or enchantment. You gain life equal to its converted mana cost.

Urza’s Factory

: Add .
, : Create a 2/2 colorless Assembly-Worker artifact creature token.

Fireball

This spell costs more to cast for each target beyond the first.
Fireball deals X damage divided evenly, rounded down, among any number of targets.

Circle of Protection: Red

: The next time a red source of your choice would deal damage to you this turn, prevent that damage.

Celestial Ancient

Flying
Whenever you cast an enchantment spell, put a +1/+1 counter on each creature you control.

Cage of Hands

Enchant creature
Enchanted creature can’t attack or block.
: Return Cage of Hands to its owner’s hand.

Slipstream Eel

Slipstream Eel can’t attack unless defending player controls an Island.
Cycling (, Discard this card: Draw a card.)

Oni of Wild Places

Haste
At the beginning of your upkeep, return a red creature you control to its owner’s hand.

Reprocess

Sacrifice any number of artifacts, creatures, and/or lands. Draw a card for each permanent sacrificed this way.