I just ran into this same problem where I had 248 construct scute swarm creatures that each had 248/248 power and toughness. I had 142 life and my opponent had negative 4,453 life but because they had a selfless samurai reconfigured with a cloudsteel kirin they could not lose the game and I couldnot win the game. Couple that with a Cleric Class level 2. Everytime they attacked with it alone it gave it lifelink which inturn gave it a +1/+1 counter from the Cleric Class. They also had 4 cosmos elixirs on the battlefield. So every time they would increase there power and toughness by +5/+5 and I could not gain life anymore and due to the reconfigurment they could not lose the game and I could not win the game. Luckly I won with 26 life left and the selfless samurai was at 66/66 due to a lucky draw of a field trip where I was then able to get a Introduction To Annihilation to exile the Steelcloud kirin. If it wasn't for that I would have lost the game waiting to draw one of the 2 Field Trips I had in the deck.
I just ran into this same problem where I had 248 construct scute swarm creatures that each had 248/248 power and toughness. I had 142 life and my opponent had negative 4,453 life but because they had a selfless samurai reconfigured with a cloudsteel kirin they could not lose the game and I couldnot win the game. Couple that with a Cleric Class level 2. Everytime they attacked with it alone it gave it lifelink which inturn gave it a +1/+1 counter from the Cleric Class. They also had 4 cosmos elixirs on the battlefield. So every time they would increase there power and toughness by +5/+5 and I could not gain life anymore and due to the reconfigurment they could not lose the game and I could not win the game. Luckly I won with 26 life left and the selfless samurai was at 66/66 due to a lucky draw of a field trip where I was then able to get a Introduction To Annihilation to exile the Steelcloud kirin. If it wasn't for that I would have lost the game waiting to draw one of the 2 Field Trips I had in the deck.