Whenever Otharri attacks, you get an experience counter
Players will need enough mana to cast multiple spells in a turn and lots of cheap instants and sorceries that target Blanka
It will only count as its main spell for abilities that care about card types like delirium
But if, in a previous turn, you earthbended The Golden Throne with Toph on the field, then when it gets exiled it'll be brought right back to the battlefield, ready to protect you again
When Modern Horizons 2 dropped, there was plenty of concern about the power of Urzas Saga and whether it should be banned in the format
Adding 20 cards to your deck seems like a massive drawback that would hamper the consistency of your deck yet Yorion got the ban hammer in several formats, and some Modern decks still tinker with 80 cards, even without the extra creature in their sideboard