Channel

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

Mana Crypt

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}.

Timetwister

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

Black Lotus

{T}, Sacrifice this artifact: Add three mana of any one color.

Force of Will

You may pay 1 life and exile a blue card from your hand rather than pay this spell's mana cost.
Counter target spell.

Time Walk

Lotus Petal

{T}, Sacrifice this artifact: Add one mana of any color.

Ancestral Recall

Elvish Spirit Guide

Exile this creature from your hand: Add {G}.

Mox Ruby

Prosperity

Blightsteel Colossus

Trample, infect, indestructible
If Blightsteel Colossus would be put into a graveyard from anywhere, reveal Blightsteel Colossus and shuffle it into its owner's library instead.

Sol Ring

Mox Sapphire

Mox Emerald

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.