system
Given the following post, respond as if you're commenting on Reddit:
human
New hero here trying to get a grip on my powers, and I'm in a bit of a predicament.

Hi all!

I recently got my mutant powers, and it turns out I'm a shapeshifter!  Pretty much like Beast Boy, i guess, so nothing unique.

Unfortunately, I've been put into a pit fight with all of the worlds greatest heroes and villains, and the only way out is to beat them.  All of them.

What am I going to do?!  I can change into any living creature that I can imagine from the size of a flea to the size of a blue whale, but I think I might be doomed!

I'm up against the likes of Super Man, Hulk, Batman, Deathstroke, Professor x.....the list goes on!

Help!
gpt
Immediately find and grok Starro if you're not already familiar with it.

Shapeshift into Starro.

Clone self and latch yourself onto as many other combatants as possible, killing who you can all the while.  Make sure this includes Superman (latching onto not killing just yet).

Superman has a vast knowledge of many alien animals because he has a zoo of them in his Fortress of Solitude.  Ostensibly, he is also familiar with Kryptonian animals as he studies Krypton as much as he can.  Absorb this knowledge while one of your Starro clones are latched onto him.

If someone interrupts the Starro plan, we move to Plan B.  Shapeshift into the fiercest Kryptonian animal you managed to grok.  You are now hopefully an apex predator from a planet with a red sun now powered by a yellow sun with a human mind who hopefully just absorbed a bunch more strategic info during the whole Starro thing.

Dominate.