ST21-015-roronoa-zoro makes sure you don't lose on threats in play when he's KO'd, forcing opponents to continue playing defensively throughout the game
A starlight rare version of Eia the Water Charmer, Gentle, can be found in the Eternity Code set
Opening Hand 9 With mana, Chaos Orb, Sylvan, and a couple of reanimation spells, this hand looks like a mediocre but probable keep
This means that, even if you have seven cards in your graveyard when you first cast the spell, if you lose cards from your graveyard before it has resolved on the stack, like through paying escape costs or a well-timed Tormods Crypt, you could fail to meet the threshold by the time it resolves
You can obtain the Milotic ex (4-Diamonds rarity) card by opening Everyday Wonders from Everyday Wonders set
That works, yes