Crobat sits on the bench and uses its ability to deal 30 damage to the opposing Pokmon in the active spot, and then we swing with Heatran, who now deals 80 damage because Crobat has already chipped them
Which for four mana, seems reasonable

Radha's Extra Combat Factory Grand Warlord Radha | Illustration by Anna Steinbauer Commander (1) Creatures (47) Angrath's Marauders Armored Transport Bloodcrazed Neonate Bolt Hound Bomat Courier Brash Taunter Combat Celebrant Copperhorn Scout Dragon Mage Falkenrath Perforator Fangren Firstborn Fierce Empath Frenzied Goblin Goblin Anarchomancer Goblin Wardriver Grenzo, Havoc Raiser Grotag Night-Runner Hanweir Garrison Heir of the Wilds Hellrider Hobgoblin Captain Kari Zev, Skyship Raider Leyline Tyrant Llanowar Elves Magus of the Library Magus of the Wheel Markov Blademaster Moraug, Fury of Akoum Mrton Stromgald Ohran Frostfang Ohran Viper Port Razer Radha, Heir to Keld Robber of the Rich Sakura-Tribe Elder Scorch Spitter Scourge of the Throne Signal Pest Stonehoof Chieftain Syr Faren, the Hengehammer Thunderfoot Baloth Tilonalli's Summoner Torbran, Thane of Red Fell Toski, Bearer of Secrets Varchild, Betrayer of Kjeldor Wood Elves Wulfgar of Icewind Dale Instant (1) Sorceries (5) Faithless Looting Rampant Growth Relentless Assault Shamanic Revelation World at War Enchantments (6) Aggravated Assault Gratuitous Violence Guardian Project Rhythm of the Wild The Flame of Keld Wild Growth Artifacts (4) Arcane Signet Bag of Holding Dolmen Gate Sol Ring Lands (35) Command Tower Evolving Wilds Forest x15 Gruul Guildgate Kazandu Refuge Mountain x14 Myriad Landscape Rugged Highlands Grand Warlord Radhas Dominaria form works great as a mana-generating aggressive deck, which suits extra combat steps well

Ancient Imperiosaur + Hierophant Bio-Titan Two big, dumb, cost-cutting green creatures we all sorta wish had more protection than ward 2 given the investment