Ikoria looks wild and experimental
+1/+1 counters aren't "attached" to the creatures they're on like an Aura or Equipment is, so a +1/+1 counter/Food token that becomes a creature stays on the creature its on
Several Rank 9s are on DP for whatever reason, so you could use those with Level 4s, Level 5s could run Dora (Number 81 I believe) to protect their field or Gustav Max to finish off the game, Level 3s could get 62 or 107 for extreme comeback purposes, 2s could run Big Eye cause it's Big Eye, and 1s could get free recovery off M7
Ifrit should last long enough to trade off with something good in combat while it also helps you to filter some cards out of your hand
Can I collect Pokemon cards just for fun, without investing money seriously
Just be sure to buy from reputable sellers to avoid getting scammed