In the right Commander deck, Krenko's goblin recruitment power is exponential, and it will fly right off the charts
Most decks that have shells that can exploit Storm are built to win all in one turn
The popular Red Purple Luffy choice in OP09 meta is the late-game approach, including high-cost cards to overpower opponents in the late-game
Notably, that +1 ability could create a single bug token, but if the cards in your deck are all lined up just so (and you happen to be running a lot of insects) it could create an unstoppable horde - and super early in the game too
Its not the most expensive summon though, which is an honor that belongs to a card which is coming soon below
If the target permanent is an illegal target when Bahamut's third chapter ability tries to resolve, it won't resolve and none of its effects will happen