The best comparison I can think of for it in RDW is Searing Blaze, essentially a removal spell but one that also applies pressure
A 3/3 for three mana, with three keyword abilities is already pretty solid, but Sigurd comes with two more abilities to make him even better
Calamity of the Titans , Perilous Vault , All is Dust , and Blast Zone are just there for when Meteor Golem , Titan's Presence , and Ugin, the Ineffable aren't enough to keep you at the top of the giant monster leaderboard
Before reanimating, you can force everyone to discard, an effect that wont be as bad for you since youre using your graveyard as a resource

Eulose | Commander | Jason Alt Commander (1) 1 Rubinia Soulsinger Creatures (25) 1 Ambassador Laquatus 1 Avenger of Zendikar 1 Biomancer's Familiar 1 Birds of Paradise 1 Bloom Tender 1 Bramble Sovereign 1 Cloudblazer 1 Eternal Witness 1 Fyndhorn Elder 1 Hornet Queen 1 Incubation Druid 1 Man-o'-War 1 Memnarch 1 Murkfiend Liege 1 Reclamation Sage 1 Rhys the Redeemed 1 Sakura-Tribe Elder 1 Scion of Vitu-Ghazi 1 Selesnya Eulogist 1 Thrasios, Triton Hero 1 Trostani, Selesnya's Voice 1 Vitu-Ghazi Guildmage 1 Voice of Resurgence 1 Wayfaring Temple 1 Wurmcoil Engine Instants (5) 1 Cyclonic Rift 1 Druid's Deliverance 1 Rootborn Defenses 1 Second Harvest 1 Sundering Growth Sorceries (10) 1 Clone Legion 1 Cultivate 1 Expropriate 1 Hour of Reckoning 1 Kodama's Reach 1 Quasiduplicate 1 Rampant Growth 1 Rite of Replication 1 Shamanic Revelation 1 Zndrsplt's Judgment Enchantments (14) 1 Anointed Procession 1 Aura Shards 1 Cryptolith Rite 1 Followed Footsteps 1 Growing Ranks 1 Growing Rites of Itlimoc 1 Intangible Virtue 1 Intruder Alarm 1 Mirari's Wake 1 Mystic Remora 1 Parallel Lives 1 Rhystic Study 1 Smothering Tithe 1 Training Grounds Artifacts (11) 1 Altar of Dementia 1 Blade of Selves 1 Heartstone 1 Helm of the Host 1 Illusionist's Bracers 1 Mana Vault 1 Mimic Vat 1 Phyrexian Processor 1 Selesnya Signet 1 Simic Signet 1 Sol Ring Lands (37) 4 Island 4 Plains 9 Forest 1 Azorius Chancery 1 Bant Panorama 1 Breeding Pool 1 Canopy Vista 1 Command Tower 1 Detection Tower 1 Evolving Wilds 1 Glacial Fortress 1 Hallowed Fountain 1 Hinterland Harbor 1 Irrigated Farmland 1 Prairie Stream 1 Reliquary Tower 1 Seaside Citadel 1 Selesnya Sanctuary 1 Simic Growth Chamber 1 Sunpetal Grove 1 Temple Garden 1 Temple of Mystery 1 Terramorphic Expanse This is pretty rough, but I like what it does

This makes it a great creature to cast after a board wipe or into an open field