Aquapolis Lugia - $800 ungraded / $10k at PSA10 6
Halvar, God of Battle / Sword of the Realms This came out when WotC seemed to be trying very hard to make equipment matters a thing (and kinda did, to be honest)
The other card, Mulan, Disguised Soldier, is also perfect for the early game, as you can play it to potentially draw into one of your many powerful items and create a chain of drawing more cards
Finally, the card draw and reanimation effects are inefficiently costed, even at instant speed, but that makes them far from irrelevant
For more information, check out our guides on the most expensive Pokemon TCG cards and an explainer of what the symbols on the cards mean
Neverwinter Hydra Neverwinter Hydra has ward 4, which helps a lot in surviving opposing removal