Scaleguard Sentinels 
Creature — Human Soldier
As an additional cost to cast this spell, you may reveal a Dragon card from your hand. This creature enters with a +1/+1 counter on it if you revealed a Dragon card or controlled a Dragon as you cast this spell.
Legality
standardNOT LEGALpioneerLEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL