Time Walk

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.

Power Sink

Counter target spell unless its controller pays {X}. If that player doesn't, they tap all lands with mana abilities they control and lose all unspent mana.

Mox Sapphire

Mountain

Ancestral Recall

Counterspell

Island

Regrowth

Return target card from your graveyard to your hand.

Mox Pearl

Disrupting Scepter

{3}, {T}: Target player discards a card. Activate only during your turn.

Birds of Paradise

Fastbond

You may play any number of lands on each of your turns.
Whenever you play a land, if it wasn't the first land you played this turn, Fastbond deals 1 damage to you.

Black Lotus

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

Icy Manipulator

{1}, {T}: Tap target artifact, creature, or land.

Psychic Venom

Enchant land
Whenever enchanted land becomes tapped, Psychic Venom deals 2 damage to that land's controller.

Sol Ring

Forest

Channel

Until end of turn, any time you could activate a mana ability, you may pay 1 life. If you do, add {C}.

Control Magic

Enchant creature
You control enchanted creature.

Tropical Island

Taiga

Unsummon

Return target creature to its owner's hand.

Timetwister

Each player shuffles their hand and graveyard into their library, then draws seven cards. (Then put Timetwister into its owner's graveyard.)

Psionic Blast

Psionic Blast deals 4 damage to any target and 2 damage to you.

Black Vise

As Black Vise enters, choose an opponent.
At the beginning of the chosen player's upkeep, Black Vise deals X damage to that player, where X is the number of cards in their hand minus 4.

Mana Vault

Mana Vault doesn't untap during your untap step.
At the beginning of your upkeep, you may pay {4}. If you do, untap Mana Vault.
At the beginning of your draw step, if Mana Vault is tapped, it deals 1 damage to you.
{T}: Add {C}{C}{C}.