Modern sets no longer use the stamp, so it only matters on cards printed roughly 1999-2003
Traditionally, cards that cost two mana, have a 2/2 statline, and have little-to-no relevant rules text are called "bears." That name is in honor of Grizzly Bears, an Alpha creature that was a 1G 2/2 with no additional abilities
Atarka, World Render Atarka, World Render is part of the two-hit commander club, and trample makes it especially hard to stop in combat
Rinoa is also in the set, as Rinoa Heartilly, a Legendary creature in MTG that creates the dedicated Angelo token, a 1/1 dog
[Metal][Metal][Colorless] Sunsteel Strike 230 Discard all Energy from this Pokemon
Theyre not necessary by any means, but when youre in blue, youd be doing yourself a favor to ensure you can play on the stack at least once