Reverent Mantra [Mercadian Masques] Plant {4}: Remove a doom counter

{4}: Remove a doom counter from Armageddon Clock

Set: Betrayers of Kamigawa Type: Instant — Arcane Rarity: Rare Cost: {X}{U}{U} You may exile a blue card with mana value X from your hand rather than pay this spell's mana cost

Set: Beta Edition Type: Enchantment — Aura Rarity: Uncommon Cost: {W} Enchant creature

but not for a way to control it

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

Reverent Mantra [Mercadian Masques] Plant {4}: Remove a doom counterSet: Mercadian Masques Type: Instant Rarity: Rare Cost: {3}{W} You may exile a white card from your hand rather than pay this spell's mana cost. Choose a color. All creatures gain protection from the chosen color until end of turn.