What are the official rulings for Immobilizer Eldrazi?
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0. If a creature has already been legally declared as a blocker, Immobilizer Eldrazi’s ability won’t change or undo that block.
1. You compare the power and toughness as you declare blockers, not as Immobilizer Eldrazi’s ability resolves. For example, if you control a 3/3 creature as the ability resolves, then later that turn it gets +0/+1 such that it’s 3/4 as blockers are declared, it won’t be able to block.
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