Choosing a higher value for X lets you pay more mana and thus spend more colors of mana to cast it
Ice Caves of Kzeldurad Plane: Nozgorod Whenever a player casts a spell, any player may pay that spells mana cost

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With such a rich card pool to draw from, there are some incredible cards that utilize +1/+1 counters inside and outside combat
The tension between fetching for the 'best mana' verses playing around B2B/Moon is good because it creates dynamics and decisions, which is interesting (compared to everyone playing a minimum three colours with lots of doubles)
Force of Vigor is nice, but is best in mono-green, and a pricier addition