Keep in mind that double sleeve cards are illegal in some situations
It is perfectly reasonable to want to fill the deck with giant creatures like [casthaven]It That Betrays[/casthaven], [casthaven]Void Winnower[/casthaven], or even [casthaven]Lord of Extinction[/casthaven] if you like your fatties costing colored mana
The Ooze exiles cards repeatedly on demand and grows into a threat while doing so, but it requires a significant mana investment, especially if you're nomnom'ing multiple cards
If your opponent does manage to destroy this card in battle, not only can you search a normal spell from your deck & add it to your hand, but you can also just pendulum summon him back next turn
By wearing a Charizard out to the fight and to the press conference that followed, Paul did just that: made himself more money
The identifying names make all the sense in the world there