Hollow One

five generic mana Artifact Creature — GolemPower and toughness4/4

This spell costs two generic mana less to cast for each card you've cycled or discarded this turn.

Cycling two generic mana (, Discard this card: Draw a card.)

The embodiment of yearning, forever drifting the deserts to find what had once made it whole.

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Showing Hour of Devastation#163

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Hollow One rulings

2021-03-19
Hollow One's cost is reduced even if the cards you've cycled or discarded aren't in your graveyard.
2021-03-19
To determine the total cost of a spell, start with the mana cost or alternative cost you're paying, add any cost increases, then apply any cost reductions (such as that of Hollow One). The mana value of the spell is determined by only its mana cost, no matter what the total cost to cast that spell was.
2021-03-19
Once you've discarded three cards during one turn, Hollow One costs to cast. It won't stop at or cost negative amounts of mana.
2021-03-19
Hollow One's first ability doesn't give you permission to discard cards. You'll need another effect that instructs or allows you to discard them, such as a cycling ability.

Hollow One keyword rules

Cycling Rule 702.29

Cycling is an activated ability that functions only while the card with cycling is in a player’s hand. “Cycling [cost]” means “[Cost], Discard this card: Draw a card.”

Although the cycling ability can be activated only if the card is in a player’s hand, it continues to exist while the object is on the battlefield and in all other zones. Therefore objects with cycling will be affected by effects that depend on objects having one or more activated abilities.

Some cards with cycling have abilities that trigger when they’re cycled. “When you cycle this card” means “When you discard this card to pay an activation cost of a cycling ability.” These abilities trigger from whatever zone the card winds up in after it’s cycled.

Some cards have abilities that trigger whenever a player “cycles or discards” a card. These abilities trigger only once when a card is cycled.

Typecycling is a variant of the cycling ability. “[Type]cycling [cost]” means “[Cost], Discard this card: Search your library for a [type] card, reveal it, and put it into your hand. Then shuffle your library.” This type is usually a subtype (as in “mountaincycling”) but can be any card type, subtype, supertype, or combination thereof (as in “basic landcycling”).

Typecycling abilities are cycling abilities, and typecycling costs are cycling costs. Any cards that trigger when a player cycles a card will trigger when a card is discarded to pay an activation cost of a typecycling ability. Any effect that stops players from cycling cards will stop players from activating cards’ typecycling abilities. Any effect that increases or reduces a cycling cost will increase or reduce a typecycling cost. Any effect that looks for a card with cycling will find a card with typecycling.