The Battlefield

Altar of Dementia

$11.95

Mikaeus, the Unhallowed

$21.86

AI DraftFeb 26, 2026

Altar of Dementia + Mikaeus, the Unhallowed

Overview

If you sacrifice a non-Human creature that Mikaeus, the Unhallowed has given undying to using Altar of Dementia, the creature is moved from the battlefield to the graveyard as part of the Altar activation , Mikaeus’s granted undying triggers because the creature was put into a graveyard from the battlefield , and Altar of Dementia’s ability will mill cards equal to that creature’s power as it last existed on the battlefield [Ruling 2019-06-14].

Step 1

Activate Altar of Dementia and pay its cost by sacrificing a creature; sacrificing moves that creature from the battlefield to its owner’s graveyard as part of paying the cost .

Step 2

Because the creature was put into a graveyard from the battlefield, any undying ability it has (including undying granted by Mikaeus) triggers at that time .

Step 3

The Altar activation (which was being paid for) results in an activated ability that will be placed on the stack and eventually resolve, using the sacrificed creature’s power as it last existed on the battlefield to determine how many cards to mill [Ruling 2019-06-14].

Step 4

When the Altar ability resolves it mills the target player for that many cards (using last-known information for the creature’s power) [Ruling 2019-06-14].

Step 5

When the undying triggered ability resolves, if the creature had no +1/+1 counters when it was put into the graveyard, return it to the battlefield under its owner’s control with a +1/+1 counter on it .

Resolution

You may sacrifice a creature granted undying by Mikaeus, the Unhallowed to Altar of Dementia. The sacrifice happens as part of paying the Altar’s activation cost, moving the creature to its owner’s graveyard . That event causes undying (if present) to trigger because the creature was put into a graveyard from the battlefield . When Altar of Dementia’s ability resolves it mills cards equal to the sacrificed creature’s power as it last existed on the battlefield (use last-known information) [Ruling 2019-06-14]. If the creature had no +1/+1 counters when it was put into the graveyard, the undying trigger will return it to the battlefield with a +1/+1 counter when that trigger resolves . If Mikaeus leaves the battlefield at the same time as the creature, the undying trigger granted by Mikaeus still triggers and will return the creature if the condition is met [Ruling 2018-12-07].

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