Bugs

Bugs that can be fixed:

• Kobold Lords Pump themselves
• Pearl Dragon has wrong pump cost
• Kami is the Cresent Moon doesn't work when tapped, and isn't Legendary
• 2 images listed for Voltaic Key, even though there is only 1
• Pump knights use colorless mana to pump
• Spirit of the knight always has first strike
• Basalt/Grim monolith have timing issues with the untap
• List other approximations here

Bugs that can maybe be fixed, but require some new coder skills:

• Goldmeadow Stalwart / Wren's Run Vanquisher / Silvergill Adept do not need a reveal to play cheaply
• Merrow Reejery is missing 2ndary ability
• Cloudgoat Ranger is missing 2ndary ability
• Brainstorm doesn't let you put every type of card back into your deck

Bugs that cannot be fixed (engine limitations):

• Tooth and Nail Entwine doesn't let you play cards from your hand, only your deck
• Hybrid doesn't work
• AI can cheat when using comes into play abilities and not choose a target
• Comes into play doens't use the stack
• Colored Artifacts show as castable even when they are not
• Fetchlands / terramorphic expanse freeze the game for some versions
• CMC is wrong for add* on costs like Buyback, Entwine, etc

Unconfirmed Bugs

• Tribal Flames doesn't work