One of the most common is the +1/+1 counter, but counter markers are also used for planeswalker loyalty, to charge abilities, and for specific card qualities
Hardly the best ramp spell, but definitely not one of the worst, either.
Once it does, no other bigger creature spells you rock can be countered as well
The main way to go is likely the same path as a Voltron deck, namely getting those commander damage kills
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