Link summoning represented a drastic change in Konami's card design philosophy, and the game has changed significantly since the introduction of this mechanic
This means that Vraskas Contempt is an efficient way to deal with Rekindling Phoenix, same with many other threats in Standard
Relentless Rats on the other hand is slightly more expensive, one generic and two black, but gets +1/+1 for each other Relentless Rats on the battlefield
In 2021 Modern, in a lot of matchups, you'll be dead before you even resolve a Birthing Pod, and in the matchups where you are still alive, your opponent will likely have a Force of Negation or Solitude to disrupt your combo
In conclusion, Pokemon trading cards are still a great investment opportunity, but some consideration still would be necessary regarding the whole market
Like I said above, cards like Slipstream EelSlipstream Eel and TriskelavusTriskelavus are not the best options for copying, let alone boost the creature we clone with Mimeoplasm