Age Of Strife

Era (This enters the battlefield with an era counter for
each player. When the last era counter is removed from
it, sacrifice it. This has: "{3}: Remove an era counter
from this. Any player may activate this ability.")
Each attacking creature has +1/+0 for each
creature blocking it. Whenever it deals combat
damage to a player, its controller untaps it.
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Shared humanity doesn't quarantee fraternity.