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To activate either ability, you'll need Crackleburr plus two other creatures. Crackleburr must have been under your control since your most recent turn began (or have haste), but the other two creatures don't.
The "summoning sickness" rule applies to . If a creature with an ability hasn't been under your control since your most recent turn began, you can't activate that ability. Ignore this rule if the creature also has haste.
When you activate an ability, you untap the creature with that ability as a cost. The untap can't be responded to. (The actual ability can be responded to, of course.)
If the permanent is already untapped, you can't activate its ability. That's because you can't pay the "Untap this permanent" cost.
