Though it's a huge blow out if someone kills The Great Synthesis after chapter two, as you'll have bounced your own commander to hand and be left with no resources except the 14+ cards in your hand (how will you cope?), if you are able to get the final chapter off, it's basically a guaranteed game over
Honorable Mention: Ral, Crackling Wit Ral is somehow transformed into an otter when he planeswalks to Bloomburrow as a Courageous Critter, annoyed to be constantly whacking people with his unaccustomed tail, but of course planeswalkers dont actually have a creature type
Chaos Wrap is a festive riff on Chaos Warp
But if your question is, What unofficial, licensed cards first had Pokemon on them? then sure, you can look at non-TCG products like Bandai Carddass
Play cards off the top when theyre useful or when you need to find better ones, or leave them on top when the cost is too high or you dont mind holding them for later