TypeLegendary Artifact Equipment Collector Number353 Rarityrare ArtistEzoi As long as equipped creature is attacking, it has first strike and must be blocked if able
There's an excellent data analysis post by u/IamMandrell on reddit, analyzing trophy decks (that's to say, only looking at decks that reached 7 wins)
Cards like Unruly Catapult, Galvanic Juggernaut, Traxos, Scourge of Kroog, Staff of Compleation, Bender's Waterskin, and the game changer, Mana Vault all have ways to untap themselves
Sword of Once and Future Sword of Once and Future is certainly shaping up to be one of the best Swords, certainly on par with Sword of Fire and Ice
Hes also one of the cheapest ways to add a real clock to a control shell a 2/2 that can chip away at life totals every single turn while your other spells do double duty