Avoidance — Whenever you cast a noncreature spell, exile up to one target nonland permanent you control, then return that card to the battlefield under its owner's control.
Exile target spell, then roll a d20 and add that spell's mana value. 1—14 | You may cast the exiled card for as long as it remains exiled, and you may spend mana as though it were mana of any color to cast that spell. 15+ | You may cast the exiled card without paying its mana cost for as long as it remains exiled.
Flying Confounding Clouds — When Juvenile Mist Dragon enters, for each opponent, tap up to one target creature that player controls. Each of those creatures doesn't untap during its controller's next untap step.
Homunculus Servant — When Kenku Artificer enters, put three +1/+1 counters on up to one target noncreature artifact. That artifact becomes a 0/0 Homunculus artifact creature with flying.
Flash Enchant creature When Ray of Frost enters, if enchanted creature is red, tap it. As long as enchanted creature is red, it loses all abilities. Enchanted creature doesn't untap during its controller's untap step.