Suspend

Suspend is a keyword ability that debuted in Time Spiral.

Description
Suspend is a keyword that represents three abilities. The first is a static ability that allows you to exile the card from your hand with the specified number of time counters (the number before the dash) on it by paying its suspend cost (listed after the dash). The second is a triggered ability that removes a time counter from the suspended card at the beginning of each of your upkeeps. The third is a triggered ability that causes you to cast the card when the last time counter is removed. If you cast a creature spell this way, it gains haste until you lose control of that creature (or, in rare cases, you lose control of the creature spell while it's on the stack).

Suspend introduced time (in the form of turns) as a new resource, by allowing a player to exile a card with suspend from their hand and put a number of time counters on it. In each of that player's upkeep steps, a time counter is removed. When all counters are removed, the spell is cast, and if it's a creature, with Haste. Suspend also has its own visual cue - it involves creatures, enchantments, artifacts, sorceries, or instants coming out of a time wall.

The templating and the counter manipulation confused many players, leading to a very lukewarm initial response from the majority of players.

Suspend (called "delay" at the time) was originally designed for a cycle in Saviors of Kamigawa, but was moved because of its greater potential. Suspend was used in all of the Time Spiral block, and made a reappearance in Modern Horizons, Commander 2021 and Modern Horizons 2.

Rulings

 * The phrase "if you could cast this card from your hand" checks only for timing restrictions and permissions. This includes both what's inherent in the card's type (for example, if the card with suspend is a creature, it must be your main phase and the stack must be empty) and what's imposed by other abilities, such as flash or Meddling Mage's ability. Whether you could actually follow all steps in playing the card is irrelevant. If the card is impossible to cast due to a lack of legal targets or an unpayable mana cost, for example, it may still be exiled with suspend.
 * Exiling a card with its suspend ability is not casting that card. This action doesn't use the stack and can't be responded to.
 * If a spell with suspend has targets, the targets are chosen when the spell is cast, not when it's exiled.
 * If the first triggered ability of suspend is countered, no time counter is removed. The ability will trigger again during its owner's next upkeep.
 * When the last time counter is removed from a suspended card, the second triggered ability of suspend will trigger. It doesn't matter why the time counter was removed or whose effect removed it. (The Time Spiral reminder text is misleading on this point.)
 * If the second triggered ability of suspend is countered, the card can't be cast. It remains in the exile zone without any time counters on it for the rest of the game, and it's no longer considered suspended.
 * If the second triggered ability of suspend resolves, the card's owner must cast the spell if possible, even if that player doesn't want to. Normal timing considerations for the spell are ignored (for example, if the suspended card is a creature and this ability resolves during your upkeep, you're able to cast the card), but other play restrictions are not ignored.
 * If the second triggered ability of suspend resolves and the suspended card can't be cast due to a lack of legal targets or a cast restriction, for example, it remains in the exiled zone without any time counters on it for the rest of the game, and it's no longer considered suspended.
 * As the second triggered ability of suspend resolves, if casting the suspended card involves an additional cost, the card's owner must pay that cost if able. If they can't, the card remains exiled. If the additional cost includes mana, the situation is more complex. If the player has enough mana to pay the cost, that player must do so. If the player can't possibly pay the cost, the card remains exiled. However, if the player has the means to produce enough mana to pay the cost, then they have a choice: The player may cast the spell, produce mana, and pay the cost. Or the player may choose to play no mana abilities, thus making the card impossible to cast because the additional mana can't be paid.
 * A creature cast via suspend enters the battlefield with haste. It still has haste after the first turn it's on the battlefield as long as the same player controls it. As soon as another player takes control of it, it loses haste.