Ive found most of those to be extremely difficult, unless in a highly looked for set like 151 or eevee heroes (even then, I cant find a kabuto or kabutops unless I want to pay $20 for one)
The absolute best way to double those tokens is different depending on your situation, but the universally useful Parallel Lives, Primal Vigor, and Doubling Season always work
That is exactly why visual instruction guides work so well for moms too
Grievous Wound might not be a global shutdown, but you can use this black aura on a player that you know is using lifegain as a big part of their strategy to slow them down
In the game itself, players can look at the gifts section to see which has been claimed, confirming whether the code has been used properly
Others might quietly become staples