The Foundry

At the beginning of your upkeep, put one
"Level Up" counter on a creature you control. If you control no creatures, create one 2/2 Warframe Specter - with "For each "Level Up" counter on this token this token gets +1/+1 (Max "Level Up" counters for this token is 3). Call for
Aid - {3},{t}: Remove 3 "Level Up" counters from this card, put a Warframe creature from your library onto the battlefield."