One Does Not [Unknown Event] Mercadian Masques put a +1/+1 counter on

put a +1/+1 counter on Toothy

choose a counter on a permanent you control

Enchanted player can't activate abilities that aren't mana abilities or loyalty abilities

Each player who chose the highest number loses that much life

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One Does Not [Unknown Event] Mercadian Masques put a +1/+1 counter onSet: Unknown Event Type: Enchantment Aura Rarity: Common Cost: {1}{U} Enchant creature Enchanted creature does not simply untap during its controller's untap step. Enchanted creature has nonbasic landwalk. (It can't simply be blocked as long as defending player controls a nonbasic land.)