I'm glad that this change puts a stop to the instosis and mummy/rt/sor decks, but I'm sad that it kills nymph-SoR, steam machine-sor, squid-sor, and decks like that. I would have been much happier with a change that simply actually implemented the literal text of the card, rather than allowing the spamming of SoR on time creatures to activate them 12 times in one turn, instosis style.
edit: okay, basically i'm quoting ninja-mesaprotector. I agree word for word with what he said.