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They should be followed if you want your ad to stay at the top for as long as possible and you are not blocked

Gx archetypes tend to splash more than others, particularly GU Towns (which is incentivized to take random dual lands anyways)

It needs 1 extra summon to get its destruction effect going (build 1 counter), but it's worth the protection as an option to clear its counter instead of destroying it

On its own, Merrymaker isnt much

They haven't undergone the rules scrutiny that most Magic cards have gone through, so if you have further questions, Wizards has also put out Release Notes to cover some of the situations you could encounter

All those qualities make it tough to deal with, because the format lacks flyers or efficient removal spell to fight this dragon