Time Vault

This artifact enters tapped.
This artifact doesn't untap during your untap step.
If you would begin your turn while this artifact is tapped, you may skip that turn instead. If you do, untap this artifact.
{T}: Take an extra turn after this one.

Meekstone

Creatures with power 3 or greater don't untap during their controllers' untap steps.

Clone

You may have this creature enter as a copy of any creature on the battlefield.

Steal Artifact

Enchant artifact
You control enchanted artifact.

Braingeyser

Mirror Universe

{T}, Sacrifice this artifact: Exchange life totals with target opponent. Activate only during your upkeep.

Animate Artifact

Enchant artifact
As long as enchanted artifact isn't a creature, it's an artifact creature with power and toughness each equal to its mana value.

Recall

Discard X cards, then return a card from your graveyard to your hand for each card discarded this way. Exile Recall.

Invoke Prejudice

Whenever an opponent casts a creature spell that doesn't share a color with a creature you control, counter that spell unless that player pays {X}, where X is its mana value.

Stasis

Players skip their untap steps.
At the beginning of your upkeep, sacrifice this enchantment unless you pay {U}.

Time Walk

Jandor's Saddlebags

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.

Control Magic

Enchant creature
You control enchanted creature.

Boomerang

Return target permanent to its owner's hand.

Unsummon

Return target creature to its owner's hand.

Copy Artifact

You may have this enchantment enter as a copy of any artifact on the battlefield, except it's an enchantment in addition to its other types.

Ancestral Recall

Mishra's Factory

{T}: Add {C}.
{1}: This land becomes a 2/2 Assembly-Worker artifact creature until end of turn. It's still a land.
{T}: Target Assembly-Worker creature gets +1/+1 until end of turn.

Phantom Monster

Vesuvan Doppelganger

You may have this creature enter as a copy of any creature on the battlefield, except it doesn't copy that creature's color and it has "At the beginning of your upkeep, you may have this creature become a copy of target creature, except it doesn't copy that creature's color and it has this ability."

Prodigal Sorcerer

{T}: This creature deals 1 damage to any target.

Island

Spell Blast

Counter target spell with mana value X. (For example, if that spell's mana cost is {3}{U}{U}, X is 5.)

Library of Alexandria

{T}: Add {C}.
{T}: Draw a card. Activate only if you have exactly seven cards in hand.

Timetwister

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