Prismatic Strands [Commander 2019] Dragons of Tarkir Prerelease Promos if it isn't a mana

if it isn't a mana ability

Set: Amonkhet Invocations Type: Enchantment Rarity: Mythic Cost: {U}{U} Whenever an opponent casts a spell

whenever a player taps an Island for mana

Set: Amonkhet Invocations Type: Legendary Creature — God Rarity: Mythic Cost: {3}{R} Indestructible

Prismatic Strands [Commander 2019] Dragons of Tarkir Prerelease Promos if it isn't a manaSet: Commander 2019 Type: Instant Rarity: Common Cost: {2}{W} Prevent all damage that sources of the color of your choice would deal this turn. FlashbackTap an untapped white creature you control. (You may cast this card from your graveyard for its flashback cost. Then exile it.)