Beyond stealing a card, the on-hit trigger also provides a treasure, helping you cast the cards you stole away
Vraska, Betrayal's Sting is a flexible proliferate option that also acts as removal or a finisher, but personally I feel she's a bit overcosted at 5 mana minimum
Heliod Sun-Crowned is important as it can go infinite with plenty of cards easily, able to boost up creatures in order to win the game
Sigarda, Champion of Light is an excellent human lord that can give you more humans when it attacks, while Sigarda, Heron's Grace gives your humans hexproof
It helps many a creature efficiently win combat while inflicting some damage on the opponent, and in this case youve even got a great shot at destroying a random artifact