Permanent that costs zero mana (Lotus Petal will be used in this example), or one that costs two mana that can produce at least one mana (Arcane Signet will be used in this example) in the hand
Haunted One is the background that came packaged with Zellix in the Mind Flayarrrs precon, so theres some precedent for horror typal here
The downsides are that it doesnt have much in the way of item removal, or straight up banishing opponents characters
Double Strike Rafiqs double strike ability means that we can really leverage other combat damage triggers like Bident of Thassa and the various Equipment like Sword of Hearth and Home
Red's single-best addition to Squirrels are burn spells like Firebolt, which give your deck a way to remove blockers and deal those last points of damage
Emblems cant be removed by normal means, so even if Sephiroth is defeated, the emblem sticks around, pinging your opponents for the rest of the game