Mystical Dispute

This spell costs {2} less to cast if it targets a blue spell.
Counter target spell unless its controller pays {3}.

Snapcaster Mage

For split cards, the flashback cost you pay is determined by the half you cast

If an instant or sorcery card in your graveyard already has flashback, you may use either flashback ability to cast it from your graveyard.

If you cast a spell from a graveyard using its flashback ability, you can’t pay other alternative costs (such as that of Foil).

If you cast an instant or sorcery with {X} in its mana cost this way, you still choose the value of X as part of casting the spell and pay that cost.

You may pay any optional additional costs the spell has, such as kicker costs. You must pay any mandatory additional costs the spell has, such as that of Tormenting Voice.

Flash
When Snapcaster Mage enters the battlefield, target instant or sorcery card in your graveyard gains flashback until end of turn. The flashback cost is equal to its mana cost. (You may cast that card from your graveyard for its flashback cost. Then exile it.)

Thing in the Ice // Awoken Horror

Removing all ice counters from Thing in the Ice some other way will not cause it to transform. You’ll need to cast an instant or sorcery spell and cause its last ability to trigger.

When Thing in the Ice’s triggered ability removes the last counter from it, Awoken Horror’s ability will trigger and resolve before the spell that caused Thing in the Ice’s last ability to trigger.

For more information on double-faced cards, see the Shadows over Innistrad mechanics article (http://magic.wizards.com/en/articles/archive/feature/shadows-over-innistrad-mechanics).

Defender
Thing in the Ice enters the battlefield with four ice counters on it.
Whenever you cast an instant or sorcery spell, remove an ice counter from Thing in the Ice. Then if it has no ice counters on it, transform it.

When this creature transforms into Awoken Horror, return all non-Horror creatures to their owners' hands.

Card (4)	Type	^{$0.00 (0.00)} Price
Mystical Dispute - borderless - inverted	Instant	$0.00 ^(0.00)
Snapcaster Mage - borderless - inverted	Creature	$0.00 ^(0.00)
Thing in the Ice // Awoken Horror - borderless - inverted	Creature	$0.00 ^(0.00)
Thing in the Ice // Awoken Horror - borderless - inverted	Creature	$0.00 ^(0.00)

Regional Championship Qualifiers 2023