It's not uncommon to save three mana a turn (or more!) off a Hero of Iroas once the deck is doing its thing
Even if you arent building around dinosaurs specifically, there are plenty of cheap creatures with high powers, like Atarka Efreet, which become harder to kill thanks to Zilortha, Strength Incarnate
Some decks are equipped to draw and hold 20+ cards, in which case this red instant is the worlds largest Lava Axe and an instant-speed wheel all in one
For a mere 3 mana, youve got a body that turns every instant or sorcery you play into bonus damage
Even if you play straight two colors, it wont be hard to get to eight lands, and its well worth spending eight mana to draw three cards, gain life, and potentially kill a creature
1 Kamahl's Druidic Vow