Aside from just being a good card, I think the most important impact of Traverse the Ulvenwald is how playable it makes Ruin in Their Wake
"What is an Acorn Card in MTG's Unfinity?"
White alone only gets you so far, so MTG designers gave this card partner to open new possibilities with different color combinations
Songbird, Sonic Screamer 79%inclusion 291 decks 369 decks Baron Helmut Zemo 9.3%inclusion 157 decks 1.69K decks Taskmaster, Mercenary Mimic 9.3%inclusion 69 decks 744 decks M.O.D.O.K
But trying to fit that simple, flavorful idea of necromancy into a usable spell has created a card which not only reanimates with great efficiency, but enables all sorts of trickery due to its overlapping triggers
Serialized drop rates are complicated by their highly limited supply, but basically, you shouldnt expect to open one of these at all