All Will Be One
Enchantment
Oracle Text
Whenever you put one or more counters on a permanent or player, this enchantment deals that much damage to target opponent, creature an opponent controls, or planeswalker an opponent controls.Rulings (2)
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Wizards of the CoastAll Will Be One's ability will trigger any time you put one or more counters on a permanent or player. This might be due to a spell or ability resolving, a permanent you control entering the battlefield with counters, or combat damage from a source with toxic, infect, or wither.
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Wizards of the CoastIf more than one creature with toxic deals combat damage to a player at the same time, those counters are placed as a single event, and the ability triggers one time.