Throw in some rituals, and you may be able to win the game with Rite of the Dragoncaller in no time
Life is a fine cost its well worth it
By listening to adventurers recount their exploits and weaving them into verse, he brings forth high-difficulty versions of raids and trials (yes, really), so he should somehow create a permanent that represents a powerful and scary version of an enemy
Lets go forth into the Wilds of Eldraine
Aerith Rescue Mission creates three Hero creature tokens, which can be used as sacrifices for other effects
10 Selvala, Explorer Returned One of the more straightforward options on this list, for the low cost of three mana, Selvala, Explorer Returned is a Selesnya commander who can benefit opponents and serve as a bargaining chip, benefiting you more in the long run