Whenever you cast a spell of the chosen color, put a +1/+1 counter on this creature
With enough investment, you can bypass the vanishing downside if you pair it with proliferate cards or counter doublers
Also, the package came earlier than expected
The tribe's massive diversity does a ton, from destroying a variety of things (Wispmare, Deepfire Elemental, Fulminator Mage, Ingot Chewer, Hateflayer, Tornado Elemental, Cinder Elemental, and don't forget Shriekmaw) to having severely powerful beaters (Verdant Force, Multani, Maro-Sorcerer, Silvos, Rogue Elemental, Liege of the Tangle, Lord of Extinction, Avenger of Zendikar, Thornling, and Root Elemental) to some of the best utility creatures you can imagine (Reveillark, Brine Elemental, Vengevine, Fertilid, Smokebraider, Forgotten Ancient, Stigma Lasher, and Briarhorn) and finally to great control creatures (Dread, Windreaver, Dawn Elemental, Air Servant, Ashen Firebeast, Roil Elemental, and Time Elemental)
Better have a combat trick or a Lightning Greaves at the ready