This criterion is a matter of versatility and a large part of evaluating split cards is considering how frequently each will be a playable Magic card
But thats not funny, thats insightful
Transforming Etali, Primal Conqueror is mostly a last resort though, because why would you not want to keep casting Etali, Primal Conqueror to play all of your opponents' decks
With enough mana rocks to generate three or more mana, you can untap them for infinite mana, generate an infinite storm count and easily win through Reservoir or Urza, Lord High Artificer
Innistrad Update The green core gets two sweet upgrades from Innistrad: Ruinous Intrusion is instant speed artifact/enchantment removal, and while it costs more mana it can be a great way to load up counters onto our commanders
It sees play in Commander, Pioneer, and Pauper