From just looking at Mew ex, having a solid amount of HP for a Basic Pokemon, an Ability that can draw extra cards and a free Retreat Cost is a huge flex
Either at ridiculously low prices, or people who are trying to charge the full amount: tiny pokeballs, with no trademark
Step 5: Immediately take the portal again this will bring you back to the 5th floor right by the Team Rocket Grunt
White angels are already powerful, but green adds ramp and +1/+1 counters synergies
Myr Retriever: a deterrent if someone wants to block it, and it they do and it dies, you can get one of your much better artifacts out of the graveyard

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