Spinerock Tyrant

three generic mana one red mana Creature — DragonPower and toughness6/6

Flying

Wither (This deals damage to creatures in the form of -1/-1 counters.)

Whenever you cast an instant or sorcery spell with a single target, you may copy it. If you do, those spells gain wither. You may choose new targets for the copy.

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Spinerock Tyrant rulings

2025-11-17
The copy is created on the stack, so it's not "cast." Abilities that trigger when a player casts a spell (such as conspire's triggered ability that creates a copy of the spell) won't trigger.
2025-11-17
Any damage dealt to creatures by a source with wither, whether it's combat damage or noncombat damage, is dealt in the form of -1/-1 counters.
2025-11-17
You can't choose to pay any additional costs for the copy. However, effects based on any additional costs that were paid for the original spell are copied as though those same costs were paid for the copy too.
2025-11-17
If the spell that's copied has an X whose value was determined as it was cast, the copy will have the same value of X.
2025-11-17
The copy will have the same target unless you choose new ones. If you change the target, the new target must be legal.
2025-11-17
If the spell that's copied is modal (that is, it says "Choose one —" or the like), the copy will have the same mode or modes. You can't choose different ones.

Spinerock Tyrant keyword rules

Flying Rule 702.9

Flying is an evasion ability.

A creature with flying can’t be blocked except by creatures with flying and/or reach. A creature with flying can block a creature with or without flying. (See rule , “Declare Blockers Step,” and rule , “Reach.”)

Multiple instances of flying on the same creature are redundant.

Wither Rule 702.80

Wither is a static ability. Damage dealt to a creature by a source with wither isn’t marked on that creature. Rather, it causes that source’s controller to put that many -1/-1 counters on that creature. See rule .

If an object changes zones before an effect causes it to deal damage, its last known information is used to determine whether it had wither.

The wither rules function no matter what zone an object with wither deals damage from.

Multiple instances of wither on the same object are redundant.