You may play a land this way only during your own turn and only if you have not yet played a land this turn
Etali, Primal Storm It requires some protection and building around, but if you manage to attack with Etali, Primal Storm, you can easily outvalue your opponents quickly
He can use Dark Ruler No More to negate the effects of his opponents monsters, causing himself to suffer the drawback of not being able to inflict damage to his opponent for the rest of that turn
This year, both the MTG Grand Prix tournaments in Liverpool and Kyoto sold out at maximum capacity, and players around the world still flock to local tournaments or watch them closely on livestreams
D/D/D Stone King Darius This card is pretty specific to D/D decks, as it requires fiend monsters to special summon
I recommend playing no more than one copy though, so it won't brick your hands, while still letting it put in work when you do see it