Being able to sacrifice a creature to make an amount of 1/1 creatures equal to its mana value is very strong, especially as a response to targeted or mass removal
Illustrated by Kekai Kotaki Standard Not Legal Alchemy Not Legal Pioneer Not Legal Historic Legal Modern Legal Brawl Legal Legacy Legal Comp
(2021-02-05) Other enters-the-battlefield replacement abilities printed on the creatures entering the battlefield wont be applied because those permanents will already be copies of the target creature at that point (and therefore they wont have those abilities)
Does Oloro, Ageless Ascetic use any infinite combos
Osgir is VERY popular, and its funny that the other commander from the deck, Alibou, is the least popular and is in fact ranked below a mono-colored talking bear
Cavalier of Thorns Cavalier of Thorns is a versatile, higher-curve threat that can help you ramp into the late game and provide additional threats when it hits the bin