This is a shame, because Falco Spara is a really playable card
Warwolf (LC5D-EN209) - Legendary Collection 5D's Mega Pack - 1st Edition - Secret Rare : Toys & Games
Other cards you can include are Bacon Saver, Necro Gardna, Quillbolt Hedgehog, Breakthrough Skill, Skill Successor (basically, anything that can be activated from the graveyard), Card Trooper is another easy milling card, and Avenging Knight Parshath could be a good Synchro if you're in a really strong position
a hazy cloud like opacity is best, not crystal clear
My inclination is that the Giants are expensive enough as a whole that this is not reliable you cant cast a Giant and Squash in the same turn very easily, which leaves you more vulnerable to removal spells
In Un- games, you can choose any applicable cards from outside the game, even if they're not part of your Draft or Sealed pool or part of your Constructed sideboard