Frantic Search

Draw two cards, then discard two cards. Untap up to three lands.

Rewind

Counter target spell. Untap up to four lands.

Turnabout

Choose artifact, creature, or land. Tap all untapped permanents of the chosen type target player controls, or untap all tapped permanents of that type that player controls.

Twiddle

You may tap or untap target artifact, creature, or land.

Twitch

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

Koth of the Hammer Emblem

Mountains you control have '{T}: This land deals 1 damage to any target.'

Peregrine Drake

Flying
When Peregrine Drake enters, untap up to five lands.

Lier, Disciple of the Drowned

Spells can't be countered.
Each instant and sorcery card in your graveyard has flashback. The flashback cost is equal to that card's mana cost.

Jolt

You may tap or untap target artifact, creature, or land.
Draw a card at the beginning of the next turn's upkeep.

Unwind

Counter target noncreature spell. Untap up to three lands.

Cloud of Faeries

Flying
When Cloud of Faeries enters, untap up to two lands.
Cycling {2} ({2}, Discard this card: Draw a card.)

Snap

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

Infuse

Untap target artifact, creature, or land.
Draw a card at the beginning of the next turn's upkeep.

Koth of the Hammer

+1: Untap target Mountain. It becomes a 4/4 red Elemental creature until end of turn. It's still a land.
−2: Add {R} for each Mountain you control.
−5: You get an emblem with "Mountains you control have '{T}: This land deals 1 damage to any target.'"