Scurry Oak + Cather's Crusade leads to never ending loop
Playing Scurry Oak when Cather's Crusade is on the battlefield leads to an endless loop of creating instances of squirls that then get 1+1 leading to the creation of more squirls. There's nothing that can be done but concede the game. This simply shouldn't be possible. Either ban Scurry Oak, come up with a fix such as "This action only occurs once" on Scurry Oak.
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Rezzahan#77802 commented
Since this involves creating tokens, the loop will end on Arena: once there are 250 tokens total under that player's control, which is the maximum number of tokens a player can control.
In paper there is no such limit and that loop would be a draw as per the rules. When the game enters a loop of mandatory actions with no means to stop it inherrent to the loop, the game is a draw.