Sure, you can combo it with cards that put extra counters, but if you can dedicate that much resources to one card, you can dedicate those resources to other ones that win you the game on their own, rather than relying on a combination of cards
If its late in the game and you have enough mana for X to finish everyone off, cast Ribbons to get the job done
More so, the elementary no-tools TCG variant that we play in the early game is incredibly bottom-heavy, as we basically spend 10 rounds attaching energies and dealing chip damage before someone starts winning
The Standard format sees only limited use of scry, since combo archetypes tend to be uncommon in Standard, and many Standard-legal scry cards just aren't worth including
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Combat Tutorial