Icefall Regent [Dragons of Tarkir] SWSH066 You can only use each

You can only use each of the following effects of "Exosister Mikailis" once per turn

Take control of 1 Set card in your opponent's Spell & trap Zone

Set: Shadows over Innistrad Type: Creature — Wolf Horror Rarity: Rare Cost: {R}{R} First strike

You cannot Set Spell/Trap during the turn you activate this card

if you activated this effect while this card was revealed

Icefall Regent [Dragons of Tarkir] SWSH066 You can only use eachSet: Dragons of Tarkir Type: Creature Dragon Rarity: Rare Cost: {3}{U}{U} Flying When Icefall Regent enters the battlefield, tap target creature an opponent controls. That creature doesn't untap during its controller's untap step for as long as you control Icefall Regent. Spells your opponents cast that target Icefall Regent cost {2} more to cast.