Template:An Uninvited Guest strategy

Normal

Prince Malchezaar starts with a hefty Mana bonus and will prioritise abusing his hero power, summoning 6/6 Abyssals nearly every turn. Despite this, Medivh has a massive and versatile suite of spells, allowing him to stall out the game and begin fighting back with ease once he gains enough mana.

One of the most key cards in this encounter is Archmage's Apprentice. With this card on the board every friendly spell cast gets copied back into the deck, allowing the player to unleash a flurry of spells without running out of cards - especially in combination with the Hero Power Brilliance. It also combos well with Evocation and Archmage's Insight, allowing you to play a lot of spells the same turn you summon the Apprentice.

A single use of Arcane Power will boost Arcane Explosion's damage to 6, allowing it to clear the board of most of Malchezaar's minions.

If you are lucky enough to summon Archmage Antonidas from Astral Portal, playing Archmage's Insight during the same turn will effectively result in an instant win. Since every spell will cost zero mana for the rest of the turn, and because every spell cast will add a Fireball to your hand (including Fireball itself), you can simply take your time to repeatedly cast Fireball on Prince Malchezaar until his health is depleted.

Heroic

Prince Malchezaar has an effective 120 health-pool in the Heroic fight, making it crucial to use Medivh's spells sparingly. You will also need to use your Archmage's Apprentices to generate more cards, or else you will run out of spells to finish the battle.

Mysterious Rune is very likely to play Ice Block and/or Ice Barrier, which can help you stall until you can assemble a combo.

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