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 - $6.20
Lightly Played - $5.60
Played - $4.30
Heavily Played - $3.70
Damaged - $3.10
Near Mint Non-English - $6.20
Lightly Played Non-English - $5.60
Played Non-English - $4.30
Heavily Played Non-English - $3.70
Damaged Non-English - $3.10