Taurion, Vitality of the Wild

Convoke (Your creatures can help cast this spell.
Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.)
When Taurion, Vitality of the Wild enters the battlefield, put a stamina counter on each
creature that convoked it. As long as it has a
stamina counter on it, that creature has ''{1},
Remove a stamina counter on it: It gains +0/+1
and gains hexproof until end of turn.''