But Prodigal Sorcerer (and its kindred), Rolling Thunder, and anything capable of recurring/multiple targeting are all viable
Recently it popped up to $10 and came back down, but the really impressive growth was in the foil that went from $15, doubled briefly to $30, and is back in the $22 range
You can just attack with the remaining creatures, and even if you cast it in desperation, you'll likely win with the cards you drew
As Monday's bidding drew to a close, the price initially held at $6.882 million until a flurry of last-minute offers during an extended bidding period lasting several hours drove the final auction total to $16.492 million from 97 total bids
Legality depends on the tournament format -- Destroy Evil can be legal in some formats and banned or restricted in others
I have a single Ultimate Guard Boulder 40+ that works great for this purpose