Val-Gon

+2: add one mana of any color to your mana pool, use this mana to cast dragon spells only.
-3: put 3 1/1 red dragon creature tokens into play, Stage 3
-7: you get an emblem with "dragons you control enter with X additional +1/+1 counters where X is equal 1 for every 4 stage counters you have".