The only strike against Wonder is that the two best blue archetypes in OTJ draft were blue-white and blue-green, and blue-white decks tended to have mostly flying creatures to begin with, making Wonder often redundant

Sort Card Type Litleo #11Common $0.38 Litleo #22Common $0.12 Litleo #18Common $0.58 Litleo #50Common $0.11 Litleo #14Common $0.04 Litleo #36Common $0.16 Litleo #22Common $0.03 Litleo #28Common $0.10 Litleo #31Common $0.08 Litleo #15Common $0.12 Litleo #14Common $0.21 Litleo #14Common $0.14 Litleo #15Common $0.18 Litleo #12Common $0.15 Litleo #14Common $0.43 Litleo #15Common $0.73 Litleo #8Common $0.99 Litleo #20None $2.77 Litleo #11Common $2.65 Litleo #14Common $2.00 Litleo - 015/094 #15Common $2.22 Litleo - 023/132 #23Common $0.05 Litleo - 139/132 #139Illustration Rare $5.11 Litleo (18) #18Common $0.20 Litleo (19) #19Common $0.23 Litleo (Master Ball Pattern) #15Common $1.21 Litleo (Poke Ball Pattern) #15Common $0.35 Litleo (Poke Ball Pattern) #15Common $0.85 Litleo - 139/132 #139Illustration Rare $5.11 Litleo #20None $2.77 Litleo #11Common $2.65 Litleo - 015/094 #15Common $2.22 Litleo #14Common $2.00 Litleo (Master Ball Pattern) #15Common $1.21 Litleo #8Common $0.99 Litleo (Poke Ball Pattern) #15Common $0.85 Litleo #15Common $0.73 Litleo #18Common $0.58

This set of three cards is known by many names: The Sacred Beasts, The Beast-Gods, The Three Phantasms, and The Three Phantom Demons
He certainly has the chops for it
But it's even better scalability-wise because in the late game, the tap ability keeps you relevant even after your hand's gone flat
Note: not compatible with XY sets, Black & White sets, Diamond & Pearl sets, Platinum sets or Heart Gold/Soul Silver sets