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'Whenever a creature enters, you may add an amount of {C} equal to the number of creatures you control that share a creature type with it.
'Return target nonland permanent to its owner's hand. Then that permanent's controller may sacrifice a land of their choice. If the player does, they may copy this spell and may...
'Instant and enchantment spells you cast cost {2} less to cast.
'At the beginning of your upkeep, flip a coin. If you lose the flip, this artifact deals 3 damage to you.
{T}: Add {C}{C}.
'Chain Lightning deals 3 damage to any target. Then that player or that permanent's controller may pay {R}{R}. If the player does, they may copy this spell and may choose...
'Lands target player controls don't untap during their next untap step.
'Counter target spell. At the beginning of your next main phase, add an amount of {C} equal to that spell's mana value.
'Whenever you cast a multicolored spell, create a tapped Powerstone token. (It's an artifact with "{T}: Add {C}. This mana can't be spent to cast a nonartifact spell.") {X}{X}{X}, {T}:...
Chain Reaction deals X damage to each creature, where X is the number of creatures on the battlefield.
'At the beginning of your upkeep, flip a coin. If you lose the flip, this artifact deals 3 damage to you.
{T}: Add {C}{C}.
'Chain Lightning deals 3 damage to any target. Then that player or that permanent's controller may pay {R}{R}. If the player does, they may copy this spell and may choose...
'Tap all lands target player controls and that player loses all unspent mana.