Collectible Card Game Headquarters

When using the +1 ability of Oko, Thief of Crowns, the game freezes in many cases.
-No problem when used for food tokens.
-I used the ability on Hydroid Krasis which is getting a counter to try it out. It probably freezes 100%.
-There are many situations where opponent controls Oko or even just uses that deck to freeze.

And by the way...
His +1 ability originally makes the creature a green Elk, but it is not reflected. fixed

I tested a bit with the cards you mention and a couple of others and I didn't get a crash maybe if I new exactly your set up and moves.
Fixed only 2nd ability doesn't make target green in commit 5f8d77, and already does change subtype at least in dev.