The downside here is that casting this and not transforming at least one of them in the same turn is going to feel pretty brutal in many situations, as not adding to the board at all when you spend that much mana can be a pretty serious liability
The idea here is to use a bunch of blood tokens and other discard effects and then cast this, I guess
Greaves, Sol Ring, and Tower have lots and lots of versions
Personally, I do not mind the exacerbated antics some take. I feel like my work will protect you from the judges discretion that Expert Judge X brings up, but remember that you wont get him every time
(2014-09-20) When the spell resolves, it enters the battlefield as a 2/2 creature with no name, mana cost, creature types, or abilities