For Amber, there are cards that heal, cards that weaken your opponents for a turn, and cards that let you search for character cards
Furthermore, since the June 13th price dip, both Yuna and Summon: Knights of Round in traditional and borderless form have risen in price a bit
It is banned in every other format
Because it can target both, youll nearly always have a lot of options to choose from when youre figuring out what to steal
Trading in 3 mana (2 to activate and the opportunity cost of tapping Fountainport for colorless) and a token for one card isnt the most efficient sac-for-card trade that there is, but youre paying a tax for the modality of all the other abilities and the fact that its a land, not a creature or something
Vodalian Illusionist (Mirage/Visions/Weatherlight) Part of the charm of bounce is that your opponent will have to reinvest resources to recast that creature a following turn