Twitch

You may tap or untap target artifact, creature, or land.
Draw a card.

Boomerang

Return target permanent to its owner's hand.

Island

Lotus Petal

{T}, Sacrifice Lotus Petal: Add one mana of any color.

Fireball

This spell costs {1} more to cast for each target beyond the first.
Fireball deals X damage divided evenly, rounded down, among any number of targets.

Snap

Return target creature to its owner's hand. Untap up to two lands.

Counterspell

Mountain

Disintegrate

Disintegrate deals X damage to any target. If it's a creature, it can't be regenerated this turn, and if it would die this turn, exile it instead.

Scornful Egotist

Morph {U} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)

Energy Tap

Tap target untapped creature you control. If you do, add an amount of {C} equal to that creature's mana value.

Torrent of Fire

Torrent of Fire deals damage to any target equal to the highest mana value among permanents you control.

City of Brass

Whenever City of Brass becomes tapped, it deals 1 damage to you.
{T}: Add one mana of any color.

Rush of Knowledge

Draw cards equal to the highest mana value among permanents you control.

Dispersal Shield

Counter target spell if its mana value is less than or equal to the highest mana value among permanents you control.