Assuming you have heart of kiran in play, and then you cast garruk relentless, can you crew the vehicle with garruk and then flip him to his other side (since you are lowering his loyalty counters, and then perform one of his abilities,) or can that only be done by having garruk fight another creature as per usual.
Absolutely, that works fine. Garruk Relentless' ability that makes him transform is a completely separate ability that will trigger if he ends up with two or fewer loyalty counters on him no matter the reason.
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I'm a former judge (lapsed), who keeps up to date on rules and policy. Keep in mind that judges' answers aren't necessarily more valid than those of people who aren't judges; what matters is we can quote the rules to back up our answers. When in doubt, ask for such quotes.
Thanks in advance.