Lets start with the bad news first: five-drop creatures dont have a very long history of being Modern playable, especially in recent Modern, although cards like Primeval Titan, Omnath, Locus of Creation and Yawgmoth, Thran Physician show us that more expensive creature can see be Modern staples if they have a big enough immediate impact on the game
Peter Pan won't take any damage when he challenges these characters thanks to his ability, You're Next
You get all of the ramp and haymakers you want in green, and you also and this is pretty key get to keep the haste part from red
Considering there are bazillion wizard-type creatures in MTG, Inalla is a very valuable commander if youre planning to upgrade Arcane Wizardry
Shift allows the four cost card to be deployed for only three ink, Evasive makes him difficult to challenge, and Challenger +3 gives him a boost when he's on the attack