Worship (Invocation) [Amonkhet Invocations] Urza’s Power-Plant you may change "target black

you may change "target black spell" to "target blue spell

When defeat is near and guidance is scarce

sacrifice it unless you exile another Merfolk you control

Set: Portal Three Kingdoms Type: Sorcery Rarity: Uncommon Cost: {1}{R} Rockslide Ambush deals damage to target creature equal to the number of Mountains you control

Set: Legends Type: Instant Rarity: Uncommon Cost: {U}{U} Cast this spell only during an opponent's turn after their upkeep step

Worship (Invocation) [Amonkhet Invocations] Urza’s Power-Plant you may change "target blackSet: Amonkhet Invocations Type: Enchantment Rarity: Mythic Cost: {3}{W} If you control a creature, damage that would reduce your life total to less than 1 reduces it to 1 instead.