The big downside with Grim Giganotosaurus is that it doesnt have a built-in trample effect, making it susceptible to being blocked by little 1/1s all day long
Voltaic Servant Our next cards are a bit safer to play because theyre creatures, but Voltaic Servant does its thing automatically with no mana or tapping
In most official Play
You can easily sacrifice permanents to fuel effects, and get them back again with Squall
Being locked into specific colors while having reliable access to powerful and specific enabler cards from the command zone leads to almost every card being viable somewhere, allowing players to replace generic, costly rares with obscure but synergistic commons
Before that, every symbol was printed in black regardless of how scarce the card was, which is why sorting Alpha, Beta, and Unlimited cards still takes a reference chart