Riparian Tiger 
Creature — Cat
Trample
When this creature enters, you get 
(two energy counters).
Whenever this creature attacks, you may pay . If you do, it gets +2/+2 until end of turn.
Legality
standardNOT LEGALpioneerLEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL