Dragonkin Berserker 
Creature — Human Berserker
First strike
Boast abilities you activate cost less to activate for each Dragon you control.
Boast — 
: Create a 5/5 red Dragon creature token with flying. (Activate only if this creature attacked this turn and only once each turn.)
Legality
standardNOT LEGALpioneerLEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL