Curious Ooze

When Curious Ooze enters the battlefield, each opponent exiles the top three cards of their library.
Whenever Curious Ooze attacks or blocks, each opponent exiles the top card of their library.
{1}, Put target card exiled with Curious Ooze into its owner's graveyard: Curious Ooze gets +X/+X until end of turn, where X is that cards
total converted mana cost.