AI DraftFeb 26, 2026
Heartless Hidetsugu + Solphim, Mayhem Dominus
Overview
When you activate Heartless Hidetsugu’s 
ability, it would deal noncombat damage to each player equal to half that player’s life total rounded down. Solphim, Mayhem Dominus’s static replacement effect doubles noncombat damage dealt by a source you control to any opponent or a permanent an opponent controls, so the damage Hidetsugu would deal to each opponent is doubled, while the damage it would deal to you (its controller) is not. Replacement effects are applied before damage is dealt and if the computed damage to a player would be 0, no damage is dealt and doubling can’t make it occur / .
ability, it would deal noncombat damage to each player equal to half that player’s life total rounded down. Solphim, Mayhem Dominus’s static replacement effect doubles noncombat damage dealt by a source you control to any opponent or a permanent an opponent controls, so the damage Hidetsugu would deal to each opponent is doubled, while the damage it would deal to you (its controller) is not. Replacement effects are applied before damage is dealt and if the computed damage to a player would be 0, no damage is dealt and doubling can’t make it occur / .Step 1
Activate Heartless Hidetsugu’s ability. The ability resolves and would deal to each player an amount equal to half that player’s life total, rounded down (compute those amounts using life totals at this moment).
ability. The ability resolves and would deal to each player an amount equal to half that player’s life total, rounded down (compute those amounts using life totals at this moment).Step 2
That creates a single damage event that would deal those individually computed amounts to each player; replacement and prevention effects that interact with damage are applied before the damage is dealt .
Step 3
Because Solphim’s static ability is a replacement effect that modifies noncombat damage a source you control would deal to an opponent, apply that replacement to each part of the damage event that would deal damage to an opponent / .
Step 4
For each opponent, replace the amount that would be dealt with twice that amount (double it). For you (the controller of the source), Solphim does not apply, so the original amount remains.
Step 5
After all applicable replacement effects (including Solphim) are applied, the damage is dealt simultaneously to all players with the modified amounts . The results (life loss) are then processed .
Step 6
If any computed original amount for a particular player was 0 (for example a player at 1 life -> half rounded down = 0), no damage is dealt to that player and Solphim cannot make it occur because there is no damage event to replace / .
Resolution
Activate Heartless Hidetsugu’s ability. For each player, determine half that player’s life total rounded down (the amounts the ability would deal). Solphim’s replacement effect doubles the amount that would be dealt to each opponent (because it doubles noncombat damage a source you control would deal to an opponent), but it does not double the amount dealt to you. Apply replacement effects before damage is dealt . If the original amount for a given player is 0, no damage is dealt to that player and Solphim can’t make it happen / .
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