This means that when paired with a significant amount of discard-based cards, this commander is capable of growing into a sizable threat with access to evasion through flying and the stability of lifelink
Although Yuna, Hope Of Spira is another excellent card for the iconic character, it falls over a hundred dollars short of the more elusive Grand Summoner
Their opportunity cost is very low, even if the effect isn't anything crazy
This will also add politically based removal to every deck that needs it, like Black's inability to handle artifacts or Red's enchantments or Green's creatures (typically, although there are exceptions)
Thats because Beast Within costs three mana, is an instant and can target any permanent
Using proxies is a personal decision that each player must make for themselves