Summer

Treefolk creatures you control have Firststrike.
Treefolk creatures you control get +0/+1.
If all for seasons are on the battlefield negate
their effects. Instead, all Treefolk creatures gain
Haste, Firststrike, Hexproof, Deathtouch,
and +0/+10.
Return this card from the graveyard to your
hand when you play a land.
"Summer, the season of war." - Tim