Best ways to kill a Tier 1 caster without being one

[BeholderSlayer]

Master of Many Forms wildshaped into a Dire Tortoise disguised as something else, will go before a wizard. He readies an action to disrupt the casting of time stop, and then goes first in the following full round. All of a sudden you've lost the game of rocket tag.

No, he won't, because since they both go in the surprise round initiative is rolled. The wizard has something like +40 initiative. Then the MoMF dies.