As long as your devotion to green and red is less than seven, Xenagos isn't a creature.
At the beginning of combat on your turn, another target creature you control gains haste and gets +X/+X until end of turn, where X is that creature's power.
NM-Mint - $8.30
Lightly Played - $7.90
Moderately Played - $7.50
Heavily Played - $6.60
Damaged - $5.40
NM-Mint Non English - $8.30
Lightly Played Non English - $7.90
Moderately Played Non English - $7.50
Heavily Played Non English - $6.60
Damaged Non English - $5.40