Emperor Crocodile [Urza's Destiny] BW31 You can only use each

You can only use each effect of "Icejade Aegirine" once per turn

Set: Dark Revelation Volume 1 Card type: Continuous Spell Rarity: Common Attack: 0 Defense: 0 If there is 1 or more monster(s) on the field of the controller of this card

Set: Beta Edition Type: Creature — Unicorn Rarity: Common Cost: {2}{W} "'Do you know

Set: Sword & Shield: Base Set Type: Fire Rarity: Ultra Rare Retreat cost: Colorless

then you can reveal 1 "Dark Magician" or 1 Spell/Trap that specifically lists the card "Dark Magician" in its text

Emperor Crocodile [Urza's Destiny] BW31 You can only use eachSet: Urza's Destiny Type: Creature Crocodile Rarity: Rare Cost: {3}{G} When you control no other creatures, sacrifice Emperor Crocodile. The king of Yavimaya's waters pays constant attention to his subjects . . . and thrives on their adulation.