In the Burn matchup, it really depends on how the opponent plays against you.

If they burn your creatures, that gives you a lot of time to get a solid Glimpse or NO/fattie going. Save Ooze until you can activate it several times to both regain life and get it out of burn range. Timing is also important, as you're going to need to distract your opponent with many dorks so you run down his options, then slam an Ooze and make it a 5/5 or 6/6 immediately.

Admittedly, it's easier against a mono-red Burn since they don't have countermagic.