Bugs

Bugs that can be fixed:

• Kobold Lords Pump themselves
• Pearl Dragon has wrong pump cost
• Spirit of the knight always has first strike
• Basalt/Grim monolith have timing issues with the untap
• Hybrid doesn't work
• Cruel Ultimatum doesn't return a creature
• Darksteel Ingot crashes the game if it recieves lethal damage
• Incinerate removes a creature from the game
• Sol Kanar has a 'may' ability
• Army of Allah does nothing
• Modular lets you target non-creature artifacts
• Chromatic Sphere / Star do not check summon sickness when animated
• AI is bad at using karoos (Orzhov Basillica, etc)

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
• Gauntlet of Power doubles mana from Dual Lands
• Shock lands don't count as basic land types when in play
• Progenitus only triggers from play (should trigger from hand, too)
• Glimpse the Unthinkable sometimes crashes the game

Bugs that cannot be fixed (engine limitations... I think):

• Tooth and Nail Entwine doesn't let you play cards from your hand, only your deck
• AI can cheat when using comes into play abilities and not choose a target
• Comes into play doesn't use the stack
• Colored Artifacts show as castable even when they are not
• Fetchlands / terramorphic expanse freeze the game for some versions
• Cost reductions don't apply to BuyBack and other additional cost spells
• Progenitus mana cost looks wrong (but acts right)