We wrote an in-depth blog post that explains why our proxy cards are the best
Product Details At the beginning of combat on your turn, you may move a counter from target creature you control onto a second target creature you control
However, the decks adopting its use the most (currently) are Temur Rhinos or similar Cascade-oriented decks that can levy it for an edge against matchups with Amulet Titan, Griefblade, Yawgmoth, and other top-tier decks in the format
These are a nice supplement to other good sac outlets, they benefit and provide additional synergies and can often be good inclusions
With Fetchlands and self mill effects, it is easy to load up your graveyard to pay the cost
Ive seen stable boards collapse the turn this resolves, especially when players think theyre safe at high life totals