Snapcaster Mage [Ultimate Masters] H23 You can only use each

You can only use each of the following effects of "Ravenous Crocodragon Archethys" once per turn

Set: Ugin's Fate Type: Artifact Rarity: Rare Cost: {1} Whenever another permanent enters the battlefield under your control

You can only use this effect of "Ghost Mourner & Moonlit Chill" once per turn

Set: Sun & Moon: Base Set Type: Psychic Rarity: Ultra Rare Retreat cost: Colorless

Snapcaster Mage [Ultimate Masters] H23 You can only use eachSet: Ultimate Masters Type: Creature Human Wizard Rarity: Mythic Cost: {1}{U} Flash When Snapcaster Mage enters the battlefield, target instant or sorcery card in your graveyard gains flashback until end of turn. The flashback cost is equal to its mana cost. (You may cast that card from your graveyard for its flashback cost. Then exile it.)