mtg cards like craterhoof behemoth #138 Holo from Tarkir: Dragonstorm (TDM) Proxy creatures you control gain trample and get +X/+X until end of turn MTGNexus - Craterhoof Behemoth

Of course, in hydra tribal, even better, but also if you have a deck with clones, clones of the back of Polukranos here will see each other die to trigger multiple times for a geometric amount of hydras

And if they were, would they be true planeswalker cardsor do the candles going out represent those planeswalkers losing their sparks, leading to legendary creatures cards of the characters

Three mana buys you a full round of safety

It still saw some sideboard play, but not much

There would be a more sustainable model for this (which was a huge positive for the game and for the environment!), but there would also be a price: certain amenities would have to go, which meant no more oversized commanders