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Shanna can't be the target of abilities your opponents control.
Shanna gets +1/+1 for each creature you control.
As long as it's on the battlefield, Shanna's last ability will count itself, so it'll be at least 1/1.
Because damage remains marked on a creature until it's removed as the turn ends, nonlethal damage dealt to Shanna may become lethal if other creatures you control leave the battlefield during that turn.
Shanna's ability that modifies its power and toughness applies only while it's on the battlefield. In all other zones, it's a 0/0 creature card.
Spells your opponents control can target Shanna.
