MINE ARE:
- twilight masquerade greninja
- darkrai umbreon tag team promo
- paldean fates charizard
it will keep going up since they'll stop printing twilight soon, especially with the new mega greninja coming out later next year. it might go up and down by a little bit every now and then short term, but long term it will keep going up, assuming market doesnt for some reason die. if the twilight masquerade greninja is out of ur budget the greninja #132 promo from shrouded fable is also a good investment since black star promo cards typically do well long term. the collectr app is a good app to track the market price of cards if you want to see how they have been doing.