Less than free, in fact, as you get 2 mana to use on them
If life was paid, this planeswalker enters with two fewer loyalty counters.) [+1]: Until your next turn, up to one target creature gets -3/-0
Funnily enough, the Orzhov also like sacrificing creatures for profit
The biggest argument against Yorion, Sky Nomad decks have always been about its reduced consistency as adding 20 cards could dilute our game plan, but drawing a single Mazemind Tome will allow us to get 3 scry or draws, which we could then reset with every Yorion, Sky Nomad to continue the chain and ensure we never run out of gas the entire game
Looting and putting counters on creatures are both fine, but its the untapping two lands, and doing so for a cheap investment, that really makes the card good
Watch out