In fact, you could even dig out your toughest hitters early with Reanimate or similar cards
Prowess enables good attacks even against larger blockers, making more tokens and letting the opponent decide whether to risk it or not, after all, combat tricks are excellent with prowess creatures
When paired with Lorcana cards that can heal him or any other character with the Support ability (adds their strength to a chosen card when they quest), Olaf can actually become a very powerful card very early on
However, if youre the monarch, instead of milling two cards, those players have to mill ten instead
Suddenly youve got this monstrous Creature on your side of the field, and all you had to do to create is was spend one mana and then gain some life