With this immense upside, it isnt too shocking that this creature is selling for roughly $20 on TCGplayer
It's often better than Denying Wind, which is way more mana for 7 cards total
Slither Wing's first attack is mainly used to stall and disrupt the opponent, as it discards the top card of the opponent's deck, which is useful when dealing with cards like Ciphermaniac's Codebreaking that can place specific cards on the top of the deck
Latios IR and Latias SIR form a pair, which is likely why the price of both cards has risen dramatically
While its a seven-mana 7/7 with vigilance normally, you can first cast it as a five-mana board wipe that specifically destroys all non-Giant creatures
Rounding out green, we have two transform cards that can share abilities and buffs with the team