The price for the easier mana of a Temur commander instead of all five colors is losing access to powerful cards like Rivaz of the Claw, Taigam, Ojutai Master, Ancient Brass Dragon, and the other 5-color dragons
Only the field can be negate, and his GY activation also exists as a matter of course now, so even handicap can be taken advantage of
Then, in order to watch Judai grow, he takes over as a teacher at Duel Academia
#22 @smackjack: The barrier to entry for Standard would skyrocket for two months, and it would remain high after that if the fetches were still reasonably relevant
There are not a lot of Giants that are currently being played in Standard, so playing this card is as good as playing a Shatter the Sky