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While Assault Formation does require its controller to pay one mana in order to allow a creature to attack, this cost often a non-factor in the late game when the deck would want to be attacking

Special Summon both that target and this card

R Rare Yamatako Orochi X WATER Level 1 [ Sea SerpentTunerEffect ] ATK 0 DEF 800 This card on the field can be treated as a Level 8 monster when used for a Synchro Summon

As with previous English Mega Evolution sets, it closely mirrors its Japanese source with no additional subsets combined

This means that these spells can provide extra time for players who only need one more additional turn to win the game