Obelisk has one of the most interesting abilities that require a duelist to tribute two of his monsters on the field
(Bevy of Beebles) Jace Beleren Jace Reawakened Jace, Arcane Strategist Jace, Architect of Thought Jace, Cunning Castaway Jace, Ingenious Mind-Mage Jace, Memory Adept Jace, Mirror Mage Jace, Telepath Unbound Jace, Unraveler of Secrets Jace, Wielder of Mysteries Jace, the Living Guildpact Jace, the Mind Sculptor Jace, the Perfected Mind Kaito, Cunning Infiltrator Kasmina, Enigmatic Mentor Mordenkainen Mu Yanling Mu Yanling, Celestial Wind Mu Yanling, Sky Dancer Narset, Parter of Veils Oko, Lorwyn Liege Tamiyo, the Moon Sage Teferi, Master of Time Teferi, Temporal Archmage Teferi, Temporal Pilgrim Teferi, Timeless Voyager Tezzeret the Seeker Tezzeret, Artifice Master Tezzeret, Betrayer of Flesh Tezzeret, Cruel Machinist Vronos, Masked Inquisitor Will Kenrith Will, Scholar of Frost
Apparently, they can also control just how hard the light is because they state that the Junior Championship has the most spongy Solid Vision since the duelists are all young kids
3 Forest - Vronique Meignaud A forest floating above the ground might seem weird on any other plane, but on Zendikar, where the elemental force of the Roil distorts the natural order of things, it's just another day