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You can't wait until later in the turn

Resolve this early, and the texture of the game changes

You want to attack with Squall alone, then use its damage trigger to recur two permanents (or the same permanent twice, if you can sacrifice it between triggers)

Notice the symbols next to the attacks these indicate what a player needs to do or use in order to execute the attack

If a card with flashback is put into your graveyard during your turn, you can cast it if it's legal to do so before any other player can take any actions

You arent going to get to Snapcaster Mage your Thoughtseize, so you may as well hit Search for Tomorrow and try to kill them before they hit six mana