Its a great card to boost up a Steel deck, and it is currently worth around $129.00 on TCGPlayer , although the market price has yet to be determined
Teferi's last ability means that in order for an opponent to cast a spell, it must be that opponent's turn, during a main phase, and the stack must be empty
You can't wait to play it later in the turn
A basic example of this would be a card like Relentless Rats, a rat that gets stronger when more copies of the same card are played
Once you exert the opposing character, you can then play a song with a cost equal or less than that characters cost for free
Rough and Tumble Creature (24) Asmodeus the Archfiend Black Dragon x2 Cleaving Reaper Cragplate Baloth Dauntless Survivor x4 Dragonsguard Elite Karfell Kennel-Master x2 Murasa Brute x3 Oran-Rief Ooze Scurrid Colony x3 Specter of the Fens x2 Vampire Spawn x3 Instant (6) Might of Murasa x4 Oblivion's Hunger x2 Sorcery (3) Rabid Bite x3 Land (27) Evolving Wilds x4 Forest x12 Swamp x11 There isnt a ton of synergy between the black and green cards in Rough and Tumble
