The backup commander is also a five-color Elemental with first strike, vigilance, and trample
If Bruse Tarl and Ishai are your commanders, your deck may contain cards with red, white, and/or blue in their color identity, but not cards with green or black
Why did the creatures have to be able to change back and forth
Brandon and Brian brought the Silly Putty Ball over to the main section of TCG R&D (Brandon and Brian work in a different but nearby section.) While talking about what we could do with the Silly Putty Ball, someone (I don't remember who) said, You know, I think we have enough Silly Putty that we could cover that table. And many man hours later, we had the very first R&D Silly Putty table
Where these cards go from good to excellent is the Paradigm mechanic which, after your first time successfully casting the spell, lets you cast it each turn again for free
Symbiote Spider-Man #156 Marvel's Spider-Man Change Version Symbiote Spider-Man Legendary Creature Symbiote Spider Hero Whenever this creature deals combat damage to a player, look at that many cards from the top of your library