Obviously, it requires an opponent to be at exactly 10 life, if they go down to 9 or gain just 1 to 11, it can't be played
They are my second highest scoring planeswalker, and I run them all over the block and back again
On the other hand, counterfeit cards are designed to be as realistic as possible to fool people into thinking they are real, so while all counterfeit cards are technically proxies, not all proxies are counterfeit cards
Prison/stax decks stop your opponent from playing cards and attacking you while gaining incremental advantages over time, be it with lifegain, Treasure tokens, or card draw
Look for deathtouch matter additions like Fynn, the Fangbearer which can turn a game around if you have enough deathtouch snakes or cards like Mirkwood Bats that can punish players while you create (or lose) tokens