Thryx, the Sudden Storm

three generic mana one blue mana Legendary Creature — Elemental GiantPower and toughness4/5

Flash (You may cast this spell any time you could cast an instant.)

Flying

Spells you cast with mana value 5 or greater cost one generic mana less to cast and can't be countered.

Even in their mountain fortresses, the Akroans have learned not to anger Thassa.

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0.34 $

Foil 0.34 $

28 printings · up to 3.30 $

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Thryx, the Sudden Storm rulings

2020-01-24
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 Thryx). The mana value of the spell remains unchanged, no matter what the total cost to cast it was.
2020-01-24
For spells with in their mana costs, use the value chosen for X to determine the spell's mana value.
2020-01-24
Thryx's last ability doesn't apply to itself while it's a spell.
2020-01-24
A spell or ability that counters spells can still target spells you control with mana value 5 or greater. When that spell or ability resolves, your spell won't be countered, but any additional effects of the countering spell or ability will still happen.
2020-01-24
If Thryx enters the battlefield while a spell with mana value 5 or greater that you cast is on the stack, that spell can't be countered, even though you don't get the discount.
2020-01-24
Players can't attempt to remove Thryx to raise the cost of a spell you wish to cast, but they can remove it to allow their spells and abilities to counter your spells.

Thryx, the Sudden Storm 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.

Flash Rule 702.8

Flash is a static ability that functions in any zone from which you could play the card it’s on. “Flash” means “You may play this card any time you could cast an instant.”

Multiple instances of flash on the same object are redundant.