If you've got a deck with a big commander, or a solid amount of creatures with large butts, you can easily make Toxic DelugeToxic Deluge one-sided by choosing a lower number
If you have no cards in hand, choose one or more instead
Your ability to open packs meanwhile is governed by a 12-hour timer, which you can accelerate with an in-game currency called Pack Hourglasses, and given the level of rarity of different cards - and the scarcity of packs - that means collecting 'em all is going to take a very, very long time
Considering certification by recognized organizations (PSA, BGS, CGC) can authenticate the card, assess its grade, and protect its integrity, thus ensuring a better long-term investment.
That said, it doesnt do too much for oozes specifically, but making more oozes certainly helps
The same is true of Shichifukujin Dragon