The Unbroken Bonds Squirtle goes for anywhere from $6-80 depending on its condition and/or holographic iteration, while the McDonald's non-holographic Squirtle resells for $3-10, and the holographic version for $12-20
Normal-type mons you can consider switching in are Farfetchd , a basic Pokemon that can deal 40 damage with just one Energy, or Kangaskhan , another basic Pokemon that can deal up to 60 energy with just one Energy
Most formats let you play just four copies of a card (or just one in EDH) but you can instead put nine Nazgul in your deck, one for each of the different artworks
The artwork by Mitsuhiro Arita is the same illustration that appears on the Unlimited and Shadowless versions, but the 1st Edition stamp transforms it from a beautiful piece of card art into a piece of cultural history
With Auriok Steelshaper, Kill the Forgemaster and any one or zero-cost creature it can be infinite card draw