Sheoldred, Whispering One [Iconic Masters] Kaladesh Promos Activated abilities of sources with

Activated abilities of sources with the chosen name can't be activated unless they're mana abilities

Set: Urza's Destiny Type: Enchantment Rare Cost: {2}{W}{W} Each other non-Aura enchantment is a creature in addition to its other types and has base power and base toughness each equal to its converted mana cost

Set: Limited Edition Alpha Type: Enchantment Rarity: Uncommon Cost: {U}{U} Whenever a Forest an opponent controls becomes tapped

For reasons unknown to Crovax

At the academy

Sheoldred, Whispering One [Iconic Masters] Kaladesh Promos Activated abilities of sources withSet: Iconic Masters Type: Legendary Creature Praetor Mythic Cost: {5}{B}{B} Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.) At the beginning of your upkeep, return target creature card from your graveyard to the battlefield. At the beginning of each opponent's upkeep, that player sacrifices a creature.