Confidence:StrongSolidPlausibleTentativeSpeculative

• Helping Hand

  W

  SorceryW

  Helping Hand puts Harsh Mentor onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Unearth

  B

  SorceryB

  Unearth puts Harsh Mentor onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Delney, Streetwise Lookout

  2W

  Legendary Creature — Human ScoutW

  Delney, Streetwise Lookout makes Harsh Mentor's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• Roaming Throne

  4

  Artifact Creature — GolemC

  Roaming Throne makes Harsh Mentor's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• Mirror Room // Fractured Realm

  2U5UU

  Enchantment — Room // Enchantment — RoomU

  Mirror Room makes Harsh Mentor's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• Wizard's Staff

  1U

  Artifact — EquipmentU

  Wizard's Staff makes Harsh Mentor's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• Reanimate

  B

  SorceryB

  Reanimate puts Harsh Mentor onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• The Flame of Keld

  1R

  Enchantment — SagaR

  Harsh Mentor deals damage, and The Flame of Keld makes each hit bigger — it doubles, triples or adds to the damage your sources deal.
• Grave Researcher // Reanimate

  2BB

  Creature — Troll Warlock // SorceryB

  Grave Researcher puts Harsh Mentor onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• City on Fire

  5RRR

  EnchantmentR

  Harsh Mentor deals damage, and City on Fire makes each hit bigger — it doubles, triples or adds to the damage your sources deal.
• Fiery Emancipation

  3RRR

  EnchantmentR

  Harsh Mentor deals damage, and Fiery Emancipation makes each hit bigger — it doubles, triples or adds to the damage your sources deal.
• Sawhorn Nemesis

  3R

  Creature — DinosaurR

  Harsh Mentor deals damage, and Sawhorn Nemesis makes each hit bigger — it doubles, triples or adds to the damage your sources deal.
• Rem Karolus, Stalwart Slayer

  1RW

  Legendary Creature — Human KnightRW

  Harsh Mentor deals damage, and Rem Karolus, Stalwart Slayer makes each hit bigger — it doubles, triples or adds to the damage your sources deal.
• Twinflame Tyrant

  3RR

  Creature — DragonR

  Harsh Mentor deals damage, and Twinflame Tyrant makes each hit bigger — it doubles, triples or adds to the damage your sources deal.
• Tor Wauki the Younger

  3BR

  Legendary Creature — Human ArcherBR

  Harsh Mentor deals damage, and Tor Wauki the Younger makes each hit bigger — it doubles, triples or adds to the damage your sources deal.
• Torbran, Thane of Red Fell

  1RRR

  Legendary Creature — Dwarf NobleR

  Harsh Mentor deals damage, and Torbran, Thane of Red Fell makes each hit bigger — it doubles, triples or adds to the damage your sources deal.
• Absorbing Man and Titania

  3RG

  Legendary Creature — Human VillainGR

  Harsh Mentor deals damage, and Absorbing Man and Titania makes each hit bigger — it doubles, triples or adds to the damage your sources deal.
• Gisela, Blade of Goldnight

  4RWW

  Legendary Creature — AngelRW

  Harsh Mentor deals damage, and Gisela, Blade of Goldnight makes each hit bigger — it doubles, triples or adds to the damage your sources deal.
• Spiked Corridor // Torture Pit

  3R3R

  Enchantment — Room // Enchantment — RoomR

  Harsh Mentor deals damage, and Spiked Corridor makes each hit bigger — it doubles, triples or adds to the damage your sources deal.
• Thor, Asgard's Avenger

  2RR

  Legendary Creature — God Warrior HeroR

  Harsh Mentor deals damage, and Thor, Asgard's Avenger makes each hit bigger — it doubles, triples or adds to the damage your sources deal.
• Lightning, Army of One

  1RW

  Legendary Creature — Human SoldierRW

  Harsh Mentor deals damage, and Lightning, Army of One makes each hit bigger — it doubles, triples or adds to the damage your sources deal.
• Solphim, Mayhem Dominus

  2RR

  Legendary Creature — Phyrexian HorrorR

  Harsh Mentor deals damage, and Solphim, Mayhem Dominus makes each hit bigger — it doubles, triples or adds to the damage your sources deal.
• Isengard Unleashed

  2RRR

  SorceryR

  Harsh Mentor deals damage, and Isengard Unleashed makes each hit bigger — it doubles, triples or adds to the damage your sources deal.
• Rankle and Torbran

  1BBRR

  Legendary Creature — Faerie DwarfBR

  Harsh Mentor deals damage, and Rankle and Torbran makes each hit bigger — it doubles, triples or adds to the damage your sources deal.
• Insult // Injury

  2R2R

  Sorcery // SorceryR

  Harsh Mentor deals damage, and Insult makes each hit bigger — it doubles, triples or adds to the damage your sources deal.