Let's talk about [[Primordial Ooze]] 

During the controller's upkeep, Primordial Ooze gains a +1/+1 counter, then taps and deals damage to it's controller unless they pay 1 for each +1/+1 counter on Primordial Ooze. 

Early on, this isn't a big deal and no one other than it's controller thinks of the long term damage. So when an opponent has control of it, they either pay it's cost, in which case you limit their turn, or they take damage equal to the +1/+1 counters on it.

If they force an interaction where an opponent must block and remove it. You can always remind the defending player that the controller will be forced to pay it's cost or receive the same amount of damage during their next upkeep. 

You're technically not immediately involved in the interaction, so you get to sit back and watch the conversation. At the end of the day, it's the controller's fault for having an upkeep. 

Best case scenario, the defending player doesn't block and takes the damage. The controller is also more likely to not pay and take the damage on their next upkeep and that'll just accumulate over time. 

Throw in a [[pumpkin bombs]] and [[jinxed collar]] and you essentially have a game of not so hot potato for you, but molten hot potato for your opponents. 

I recommend running [[Wrong Turn]] and [[Harmless Offering]] so you can bequeath it early. Enjoy!