Indestructible (Effects that say "destroy" don't destroy that permanent. An indestructible creature can't be destroyed by damage.)
As long as your
devotion to red
(Each 
in the mana costs of permanents you control counts towards your devotion to red.) and green is less than seven, Xenagos isn't a creature.
At the beginning of combat on your turn, another target creature you control gains
haste (This creature can attack, 
and 
as soon as it comes under your control.) and gets +X/+X until end of turn, where X is that creature's power.
Vintage
Historic
