If you do, creatures you control get +X/+0 until end of turn, where X is the number of opponents you have
Self-Bounce Pricey Artifacts Rakalite / Cyclopean Snare / Razor Boomerang This Trio of Torture gives people the ability to do something decent at best, and then to bounce it back to your hand as part of its effect, thereby requiring to recast it over and over and over and over and over and over and over and over again
It's an interesting discussion point in theory, but not practical
This one will be quite meta-dependent, but if youre regularly playing in pods where targeted removal is common practice - and lets be honest, it should be - then you might want to consider this card
It rarely moves, standing stock still in its clearing
Given these restrictions I was able to come up with one legendary creature that seemed like the best fit