Casting him for ten mana is ambitious, but reanimating him from the graveyard is easy enough
You naturally receive a lot of free card packs from free-to-play, and you can disenchant these cards into dust and focus on buying the most powerful cards for one or two decks only
Each time you earthbend, youll put +1/+1 counters on a land, empowering it to attack and block
Confining its abilities to sorcery speed hampers its power, but perhaps necessarily
(2015-08-25) If you cast a spell with converge without spending any mana to cast it (perhaps because an effect allowed you to cast it without paying its mana cost), then the number of colors spent to cast it will be zero
In some cases, these precede triggered or activated abilities on a card