Mure, Colossal Temple

Companion - Your starting deck only contains
cards with green, white or colorless color identity.
Convoke
When Mure, the Colossal Temple enters the
battlefield, tap up to X target enemy creatures.
Whenever a creature you control attacks alone,
you may tap any amount of creatures. Tap the
same amount of creatures an opponent controls.
The attacking creature gets +1/+1 for each
tapped enemy creature until the end of the turn.