Use the cards you milled to escape the Diamond, which you use to cast Brain Freeze again, and so on and so forth, until there's enough storm copies of Brain Freeze to mill your opponent
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Among the Trap Hole and Hole variants that currently exist in the game, Trap Hole isnt as useful due to its limited scope (only Normals and Flips, as opposed to the many summoning mechanics in the game)
Chevill, Bane of Monsters can put bounties on creatures and planeswalkers, but that doesnt matter so much if your opponents can blink their creatures
Legality depends on the tournament format -- Fighting Au Lait sv2 181 can be legal in some formats and banned or restricted in others
The counter adding plays into proliferate and leaders in Simic that care about counters