And, the only Evasive cards that can challenge and remove him have higher costs, thus letting Goofy quest for hopefully multiple turns
Both sides of Valki are excellent, with Valki being hand disruption useful in the early game to steal a powerful creature (with the potential to turn into it later), while Tibalt is a great end-game card, capable of removing multiple creatures and stealing cards from your opponents' libraries to cast yourself
Her heroic trigger will toss a +1/+1 counter here and then you can tap her to remove one to draw a card, for no mana down, just pure card draw
As a card type with a fundamental impact on how we play the game, there are tons of powerful creatures
Requiring five cards that are useless outside of this specific combo is a heavy deckbuilding cost, one we can avoid given that we have more efficient lines with Hulk