Why Is an Enters Ability Good on High-Cost Creatures
Sideboarding Like most things mono-red aggro, the sideboard is fairly self explanatory
Healers Hawk, Ruin-Lurker Bat, and Brightblade Stoat can come down early and start buffing your life total so its higher than your starting total by the time Elenda hits the battlefield
God-Eternal Bontu is a little different as you get a single sacrifice trigger, but you can consume your entire board and even throw away random lands or mana rocks to mitigate flooding
The Final Fantasy versions dont quite have the statlines to dominate developed boards, but they still give every deck a reasonable late-game punch basically for free while reducing the rate of mana and color screw
Plus, you're not resistant to all spells - board wipes and certain sacrifice effects will still lay your creatures low