ManaTutor, a Deck Doctor for Magic: The Gathering

Why it surfaced

This is a notably concrete tool: paste an Arena export, MTGO deck, or plain-text list and it checks curve, color balance, synergies, format legality, budget alternatives, and matchup plans. The homepage even quantifies sample advice, including when Lightning Bolt is uncastable on turn one and why Embercleave should be trimmed.

ManaTutor scans a Magic: The Gathering decklist and recommends cards to add, cut, or move into the sideboard.