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.
Near Mint - $8.60
Lightly Played - $7.70
Played - $6.00
Heavily Played - $5.20
Damaged - $4.30
Near Mint Non-English - $8.60
Lightly Played Non-English - $7.70
Played Non-English - $6.00
Heavily Played Non-English - $5.20
Damaged Non-English - $4.30