The damage to make Treasure tokens has to be from combat damage , meaning dealing damage with Captain America's effect will not create Treasures
Pristine examples of Yamato (Serial Numbered) that manage to achieve top-tier certification shatter those opening boundaries, with gem-mint specimens or sealed event prize packs commanding between $5,500 and $12,500
And while we could go on, well end with Kirlia
( can be paid with either or 2 life.) Legendary Creature - Horror Phyrexian Token Generators (CTRL to add secondary) Tutors Tutors (CTRL to add secondary) Sideboard Bloodvial Purveyor Flying, trample Whenever an opponent casts a spell, that player creates a Blood token
Also worth considering are Big Score and Seize the Spoils, which come with Treasure tokens
while the above scenarios I have actually encountered in testing, due to TyRam being not that popular anymore, I have not encountered this myself