Assuming you draw absolutely nothing helpful, how strong is each card in your hand right now
Control Magic is a powerful card in Commander already, and New Blood is a strict upgrade (since it's not an enchantment sitting on the battlefield to be killed or waiting for the creature to be blinked) if you're playing a Vampire deck
Also, unless I'm killing my opponent quickly by stacking the effects of damage, I don't like giving my opponents extra cards
Enchantment - Saga Color tag templates(None) Protean Hulk When this creature dies, search your library for any number of creature cards with total mana value 6 or less, put them onto the battlefield, then shuffle
Putting +1/+1 counters on your stuff when dealing combat damage to a player is something Im not surprised to see on Temur cards, and the card draw activated ability is also linked with this color trio, as well as working well with the first triggered ability