There are tons of cards that care about sacrifice effects and fetch lands give you another card to sacrifice Pay 1 Life Similar to sacrifice, there are many cards, and even entire deck strategies that care about you have a low life total
If you dont need the aggression, Jeskai gives you a backup plan that draws a card whenever your creatures hit a player, keeping the gas flowing while you keep turning sideways
I could also see these abilities just being enough to hang in a lot of Peasant Cubes, and realistically, this card would be kind of busted if it only cost two mana to cast it upfront
On top of that, Simba can Pounce on Evasive characters and fend off incoming challenges with six willpower
Peregrine Drake and Etherium-Horn Sorcerer mana engines and value pieces that become overwhelming with Inallas ability
Evoke allows you to pay an alternative, cheaper cost for a creature to trigger its "enter" effects at a discount, but the creature is sacrificed after those abilities trigger