You have accumulated 7+ counters on Sorin and you intend to activate his ultimate ability (its a colloquial name for a planeswalkers last ability)
You can spend up to 1 mana each time and draw one card for each mana spent

Top Five-Color Commanders The Ur-Dragon 48,979decks Jodah, the Unifier 31,506decks Kenrith, the Returned King 30,886decks Ulalek, Fused Atrocity 27,394decks Esika, God of the Tree 24,908decks Ashling, the Limitless 23,341decks Go-Shintai of Life's Origin 20,194decks Tom Bombadil 20,150decks The First Sliver 19,023decks The Wandering Minstrel 18,466decks Ezio Auditore da Firenze 18,370decks Sisay, Weatherlight Captain 18,103decks Terra, Magical Adept 17,995decks Avatar Aang 17,898decks Urtet, Remnant of Memnarch 17,740decks Morophon, the Boundless 15,375decks Marina Vendrell 14,528decks Omnath, Locus of All 14,114decks Azlask, the Swelling Scourge 13,841decks Najeela, the Blade-Blossom 13,786decks Tiamat 13,234decks Ramos, Dragon Engine 12,446decks Cosmic Spider-Man 11,953decks Child of Alara 10,716decks Sliver Overlord 10,537decks Infinite Guideline Station 9,469decks Jodah, Archmage Eternal 9,198decks Reaper King 8,939decks Codie, Vociferous Codex 8,527decks Leonardo, the Balance // Michelangelo, the Heart 8,188decks Hei Bai, Forest Guardian 6,311decks Progenitus 5,727decks Garth One-Eye 5,372decks Karona, False God 5,249decks Scion of the Ur-Dragon 5,233decks Jared Carthalion 4,945decks Sliver Hivelord 4,430decks Rukarumel, Biologist 4,396decks Niv-Mizzet Reborn 4,395decks Niv-Mizzet, Guildpact 3,890decks General Tazri 3,708decks Heroes in a Half Shell 3,619decks Horde of Notions 3,318decks Nick Fury, Agent of S.H.I.E.L.D

piece each 6-card scene together to reveal the full story PUT YOUR ART ON FULL DISPLAY While each Scene Card is a playable Magic card (including game text), each box also contains 6 Art-Only Cards, allowing you to appreciate the scenes in all their glory on the included display easels INCLUDES 3 PLAY BOOSTERS Each Scene Box also comes with 3 Play Boosters
Iroas: does waaay too much for 6 mana
Mark Ritual would be particularly beneficial in a black-red (Rakdos) deck that focuses on aggressive strategies or combo setups, as it allows for a significant mana boost while potentially converting black mana into red mana for spells or abilities that require red