Wilds of Eldraine

Icewrought Sentry | Creature | Elemental Soldier | Vigilance Whenever Icewrought Sentry attacks, you may pay {1}{U}. When you do, tap target creature an opponent controls. Whenever you tap an untapped creature an opponent controls, Icewrought Sentry gets +2/+1 until end of turn. | Brian Valeza

Succumb to the Cold | Instant | | Tap one or two target creatures an opponent controls. Put a stun counter on each of them. (If a permanent with a stun counter would become untapped, remove one from it instead.) | Andrew Mar

Tenacious Tomeseeker | Creature | Human Knight | Bargain (You may sacrifice an artifact, enchantment, or token as you cast this spell.) When Tenacious Tomeseeker enters the battlefield, if it was bargained, return target instant or sorcery card from your graveyard to your hand. | Kai Carpenter

Frolicking Familiar | Creature | Otter Wizard | Flying Whenever you cast an instant or sorcery spell, Frolicking Familiar gets +1/+1 until end of turn. | Brian Valeza

Troyan, Gutsy Explorer | Legendary Creature | Vedalken Scout | {T}: Add {G}{U}. Spend this mana only to cast spells with mana value 5 or greater or spells with {X} in their mana costs. {U}, {T}: Draw a card, then discard a card. | Jesper Ejsing