Ys / Ice Shaft

Buenas.
Esta duda ha surgido en el torneo de hoy. Tenemos Ice Shaft e Ys:
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Ice Shaft
Type: Support Faction: Neutral
Cost: 3
Game Text:
Location. Polar.
Action: Sacrifice Ice Shaft to choose and destroy a character with skill 3 or lower.
Flavor Text: "A network of interlocking shafts and tunnels? In Antartica? I don't believe it. Who would have dug them?"
Set: NN
Number: 83
Illustrator: Paul Guzenko, aka GuzBoroda
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Ys
Swallowed By The Sea
Type: Support Faction: Yog-Sothoth
Cost: 2
Game Text:
Lost Civilization.
Disrupt: When an opponent's card effect would cause a character you control to leave play, instead exhaust Ys and resolve that effect on another character you control.
Flavor Text: The tales of mariners claim that from far beneath the waves the church bells of Ys can still be heard.
Set: TKatG
Number: 24
Illustrator: Dennis Chan
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Si un jugador utiliza Ice Shaft, debe elegir un personaje de valor 3 o menos. Pero si el contrincante utiliza el efecto de Ys, ¿puede seleccionar un personaje con valor 4?
Yo creo que sí, porque Ys cambia el efecto de abandonar el juego, no el del propio Ice Shaft. Pero a ver si alguien con más conocimientos puede echarnos una mano.
Muchas gracias.
Esta duda ha surgido en el torneo de hoy. Tenemos Ice Shaft e Ys:
================================================================================
Ice Shaft
Type: Support Faction: Neutral
Cost: 3
Game Text:
Location. Polar.
Action: Sacrifice Ice Shaft to choose and destroy a character with skill 3 or lower.
Flavor Text: "A network of interlocking shafts and tunnels? In Antartica? I don't believe it. Who would have dug them?"
Set: NN
Number: 83
Illustrator: Paul Guzenko, aka GuzBoroda
================================================================================
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Ys
Swallowed By The Sea
Type: Support Faction: Yog-Sothoth
Cost: 2
Game Text:
Lost Civilization.
Disrupt: When an opponent's card effect would cause a character you control to leave play, instead exhaust Ys and resolve that effect on another character you control.
Flavor Text: The tales of mariners claim that from far beneath the waves the church bells of Ys can still be heard.
Set: TKatG
Number: 24
Illustrator: Dennis Chan
================================================================================
Si un jugador utiliza Ice Shaft, debe elegir un personaje de valor 3 o menos. Pero si el contrincante utiliza el efecto de Ys, ¿puede seleccionar un personaje con valor 4?
Yo creo que sí, porque Ys cambia el efecto de abandonar el juego, no el del propio Ice Shaft. Pero a ver si alguien con más conocimientos puede echarnos una mano.
Muchas gracias.