The combo begins in a deck that can reasonably produce red and blue mana. You’ll want to play an early Fumarole, and later, the Construct. When it comes time to attack with your seemingly harmless 2/2, you activate the Fumarole’s second ability to make it a creature, and then start activating its third ability over and over for 0 mana, flipping the power and toughness. Every time you do so (for 0 mana) the construct gets +1/+1, and you can do this as many times as you can pay 0 mana (I haven’t done the math but it should be somewhere around infinite).
Should you see this combo hit the board, I highly recommend destroying the construct before the Fumarole can be activated, or in response to the Fumarole’s second activated ability going on the stack, before it resolves (making it a creature). Once the Fumarole is a creature, there will be nothing you can do to stop the Construct from becoming an 100000000/100000000. Even if you target either with direct damage, they can continue to activate the ability in response. You can still destroy the Construct with cards like Fatal Push (with Revolt) or anything that destroys artifacts. Luckily, it will only take a 0/1 creature to block it and stop all the damage. Let’s hope they can’t find a way to give it trample…
Today Rules Tip written by Daniel Clarke