In green, this can be done by putting extra lands into play with mana ramp spells like Natures Lore, Cultivate, Kodamas Reach, and Skyshroud Claim
This particular one is a 'what if' scenario where Arthur from 1963's Sword in the Stone becomes a spellcaster in his own right
Now theres nothing left to do but party
MH2 was printed and then some, but theres only three shiny versions of this card: this etched, the pack foil from MH2, and the foil from Onslaught, which is at $70+ for the NM copies
Ezuri's passive ability lets you draw a card whenever you proliferate, turning any spells and abilities that would add counters into cantrips
Plus, since it doesnt technically counter a spell, it can be used to get around the uncounterable cards out there like Abrupt Decay