Merieke Ri Berit

Merieke Ri Berit doesn't untap during your untap step.
{T}: Gain control of target creature for as long as you control Merieke Ri Berit. When Merieke Ri Berit leaves the battlefield or becomes untapped, destroy that creature. It can't be regenerated.

Control Magic

Enchant creature
You control enchanted creature.

Mind Over Matter

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

Wrath of God

Destroy all creatures. They can't be regenerated.

Bribery

Search target opponent's library for a creature card and put that card onto the battlefield under your control. Then that player shuffles.

Command Tower

{T}: Add one mana of any color in your commander's color identity.

Bitterblossom

At the beginning of your upkeep, you lose 1 life and create a 1/1 black Faerie Rogue creature token with flying.