What it does
Delirium is a threshold-style ability that turns on once you have four or more card types among cards in your graveyard. While active, cards with delirium gain bonus effects—bigger creatures, extra abilities, or cheaper costs.
The key nuance is that it counts card types, not individual cards. The types that matter are artifact, creature, enchantment, instant, land, planeswalker, sorcery, battle, and tribal. Supertypes like "legendary" and subtypes like "Goblin" or "Equipment" don't count. So one card can contribute multiple types—an artifact creature counts as two—but you still need four distinct types total. Also, delirium checks continuously, so it can flicker on and off as your graveyard changes.
In Commander, delirium is easy to enable thanks to fetchlands, self-mill, and natural attrition over long games. Instants and sorceries are usually the trickiest types to land, so plan accordingly.
Iconic cards with Delirium
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