Technically, both cards can do the same theft effect with a small difference: The creature half can exile a card from an opponent's hand, and they pay its mana value to have Valki transform into it
Once you can sink 8+ mana into this spell then you'll probably get all the non-Aura enchantments you'd want back, plus they become 4/4 beaters, which is
Collectors and investors alike recognize this, often citing the acquisition of Alpha booster cards and packs (and occassionally a very rare Booster Box) as a crowning achievement
Here is what happens during combat: First, you declare your attack and pick which opponent you want your creature to swing at
In order to maximize our mills hitting dorks, I'll run a big number of dorks that do things
You cant really gain life on command, but cards like Treasonous Ogre, Wall of Blood, and Blood Celebrant let you lose as much life as you deem necessary