Valakut, the Molten Pinnacle's triggered ability has an "intervening 'if' clause." That means (1) the ability won't trigger at all unless, at the time a Mountain enters under your control, you control five or more Mountains other than that new one, and (2) the ability will do nothing if you control fewer than five Mountains other than that new one by the time it resolves
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Ten fan-favorite cards, including the legendary Red-Eyes Dark Dragoon and the meta-warping Super Polymerization, have been revamped with this cinematic look
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