Snap

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

Frost Breath

Tap up to two target creatures. Those creatures don't untap during their controller's next untap step.

Unsummon

Return target creature to its owner's hand.

Zethi, Arcane Blademaster

Multikicker {W/U}
When Zethi, Arcane Blademaster enters, exile up to X target instant cards from your graveyard, where X is the number of times Zethi was kicked. Put a kick counter on each of them.
Whenever Zethi attacks, copy each exiled card you own with a kick counter on it. You may cast the copies.

Stern Dismissal

Return target creature or enchantment an opponent controls to its owner's hand.

Silence

Your opponents can't cast spells this turn.

Sentinel Tower

Whenever an instant or sorcery spell is cast during your turn, Sentinel Tower deals damage to any target equal to 1 plus the number of instant and sorcery spells cast before that spell this turn.