Shorecrasher Elemental

Three blue pips on a 3/3 for three is the tell that this creature is built to be difficult, and the self-blink is what that color commitment buys. Tap one blue and it exiles itself and returns face down as a fresh 2/2, dodging targeted removal and shedding any triggers or tags an opponent tried to hang on it. The resilience is narrow, though: the returned body is a zero-mana-value 2/2, which slips out from under spot removal but walks straight into anything that sweeps small creatures, so the trick blanks a Doom Blade while doing nothing against a lockdown that catches everything at two or less. The stat-shifting ability stacks underneath while the card is face up, sliding the 3/3 toward 4/2 or 2/4 to steal or survive a combat trade at instant speed, and that mode wants only a single generic mana, not a blue one. The two lines are at war: any pumps you sink in evaporate the instant you blink, because the creature comes back as a new face-down object with no memory of the boosts, so you cannot bank a size and then duck a spell with it. Megamorph is the third gear, a cheap face-down deployment for that flips up later for with a +1/+1 counter attached. Together these make a body that is genuinely awkward to kill and irritating to block, so long as you leave that single blue pip untapped: the blink, the one line that shrugs off removal, goes dead the moment your mana is spent elsewhere.