Even without the Lattice, getting five mana is easy to do in Commander, and dropping a massive Eldrazi spell into play on turn six can be devastating to your opponents
The other bits include some Voltron commanders that are more dependent on +1/+1 counters than auras and equipment that would be destroyed by Blast, some Superfriends decks that probably should meet the "Legends" moniker anyhow, and then quite a bit of general play that I can't really explain as anything other than folks playing "CardsIOwn.dec"
Arms Scavengers spellbook contains: Boots of Speed Cliffhaven Kitesail Colossus Hammer Dueling Rapier Spare Dagger Tormentors Helm Goldvein Pick Jousting Lance Mask of Immolation Mirror Shield Relic Axe Rogues Gloves Scavenged Blade Shield of the Realm Ceremonial Knife Bloodrage Alpha continues to build on the Wolf and Werewolf theme from Innistrad: Midnight Hunt and Innistrad: Crimson Vow
While the character Kiora is a merfolk hailing from Zendikar, the planeswalker cards representing her do not have creature types, and dont count as merfolk
SR Super Rare UR Ultra Rare SE Secret Rare UL Ultimate Rare PS Platinum Secret Rare CR COLLECTOR'S RARE QCSE Quarter Century Secret Rare Effect Veiler X LIGHT Level 1 [ SpellcasterTunerEffect ] ATK 0 DEF 0 During your opponent's Main Phase (Quick Effect): You can send this card from your hand to the GY, then target 1 Effect Monster your opponent controls