Thats because you can pay one life and sacrifice a creature to put a -1/-1 counter on up to one creature and draw a card
Daretti, Scrap Savant: Let's quote what it does
Guttersnipe Kiki-Jiki, Mirror Breaker Anger Torgran, Thane of Red Fell Dualcaster Mage Scary Dragons And Other Big Creatures Red has a lot of giants, dragons, and other big monsters, but there are a few that are better suited for Commander--mostly because they provide an extra element of utility, such as card draw, mana ramp, or just good old-fashioned damage
Legendary Planeswalker - Nissa Ojer Kaslem, Deepest Growth Trample Whenever Ojer Kaslem deals combat damage to a player, reveal that many cards from the top of your library
White has a handful of options, as well as lots of ways to make a ton of small creature tokens that you can use as chump blockers or sacrifice to trigger your morbid effects