All told, we are talking about an effect here that's capable of taking you from a losing position to making you the most likely player to win the game
Then theres just attacking for the sacrifice in order draw cards with those creatures which have done their work, like Noxious Gearhulk
It won't be both the new color and colorless.

Scientists Aang's Defense Abandon Attachments Abeyance Abzan Banner Academic Dispute Academy Elite Academy Raider Academy Wall Accelerate Accumulated Knowledge Aclazotz, Deepest Betrayal Acquisition Octopus Acrobatic Maneuver Action News Crew Adrestia Adventurer's Airship Aegar, the Freezing Flame Aeon Chronicler Aerial Extortionist Aether Channeler Aether Spellbomb Aether Syphon Afflict Afterlife Insurance Agency Coroner Agent 13, Sharon Carter Agent Maria Hill Agent Venom Agna Qel'a Ahriman Air Nomad Legacy Airbending Lesson Airborne Aid Airship Engine Room Akiri, Fearless Voyager Akki Ronin Akki Scrapchomper Akoum Flameseeker Akroma's Blessing Akroma's Vengeance Aladdin's Lamp Alandra, Sky Dreamer Alania, Divergent Storm Alchemist's Apprentice Alchemist's Vial Aleatory Alhammarret's Archive All-Seeing Arbiter Alms Collector Alphinaud Leveilleur Alquist Proft, Master Sleuth Altar of the Wretched Amass the Components Amber Gristle O'Maul Ambitious Assault Aminatou, Veil Piercer Aminatou, the Fateshifter An Unearthly Child Ancestral Anger Ancestral Reminiscence Ancient Excavation Angel of the God-Pharaoh Angelheart Vial Angelic Gift Angelic Sell-Sword Angelic Sleuth Angelsong Angler's Shield Anje Falkenrath Anje, Maid of Dishonor Annihilate

And is that worth messing up the databases of MTG websites with that colon in the Ratonhnhakton name
Gray Viking Games is a reliable option and we've written up a pretty comprehensive review for GVG, which I highly recommend you take a look at