It's actually two cards, that combine to form a single card with the standard M:TG monster, representing you summoning a 99/99 Big Furry Monster that also requires you to pay a frick-ton of black mana, and can only exist if both card sits no the board, because it's such a big furry giant-thing
If you cast a card for its prototype cost, it'll have the second set of characteristics both as a spell and as a permanent on the battlefield
With a high density of even-cost Clones, including Spark Double, as long as you didnt whiff, you could keep selecting Clones with Gyrudas triggered ability, copying Gyruda, and eventually win the game by either Milling your opponent out or presenting an insurmountable board presence
Muddle, the Ever-Changing Muddle, the Ever-Changing is an intriguing otter
What cards do you have access to