Card of the Week Contest #457: Some sacrifices must be made.

An older design, but fits here... but I see another similar submission so will likely change mine if I have time.

So, I wanna preface this by telling the story of how it came about.  Years ago, I asked my mom to say the first word off the top of her head, and she said "Banana."  That led me to design an artifact that you could pay mana, tap, and sac it to either tap target creature or regenerate target Ape or Monkey.  We'll fast forward to a few years later, when I ask her (in the same room as before, even!), to say the first thing that comes into her head.  Once again, she said "Banana."  Tried again, "Blackfish."  Tried again, "Motor oil."



Can of Motor Oil 
Artifact
, , Sacrifice Can of Motor Oil: Target Vehicle gains haste and becomes a creature until end of turn.

I think it bears pointing out that the typical mana value of a card that gives you one extra turn is typically at least 5, with cards that cost 2-3 usually come with a massive downside like skipping your untap step or losing the game at the end of the extra turn. Meanwhile there are exactly two cards in the game that let you take two extra turns and the non-Teferi one is Time Stretch for a whole ten mana. Your card can potentially give way more than 2 turns, especially if there are are proliferate shenanigans around. It's your decision of course, but I think you may want to reconsider the cost.

I have idea of red black create card whose power and toughness is equal to the amount of amount of creature cards that have died while this is on battle and thus it’s power keeps rising and you can sacrifice this card and it deals direct damage to target you select and the damage is equal to its power when you sacrificed it but I feel this card would be way too over powered. Am I right and if so is their a way to balance it while still keeping this similar effect. Is the mechanics unique and useful? Or should I scrap it for other idea. The idea behind this card is that it’s golem animated (or a giant spirit amalgam monster) by the souls of those died in battle and now they have come for revenge “we are the souls those you have killed now die in fires of our burning anger”

Thanks though my concern is not unique enough or as useful, when I vote for card creations I do it based on 3 categories balance, usefulness, uniqueness like my “planar interference” card would be useful in commander play since it affects all opponent cards Unlike your recommendation “pithing needle” which is useful but you have to keep it on hand and time it right in magic the gathering arena there are workplaces who is multi planes walkers in their decks and in commander with multiple opponents who are likely to use a Planeswalker it super useful albeit this card only effective if there is a Planeswalker card or else it wasted, kind of like a black nettle card that has protection against green cards. My biggest concern for this card is that it might be less useful than the enchantment “burning anger” which gives creature card the ability to tap out and deal deject damage equal to its power to any target

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Echoing Storm
Creature - Elemental
Blitz  (If you cast this spell for its blitz cost, it gains haste and “When this creature dies, draw a card”. Sacrifice it at the beginning of the next end step.)
When Echoing Storm dies, you may search your library for a card named Echoing Storm, and put it on top of your library.

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After talking about this card with a friend, I downshifted it to common, so it would be more viable to be of use in a theoretical draft scenario.

Going with the classic 4 mana 6/6 flying demon.



Herald of Torments
Creature - Demon
Flying
At the beginning of your upkeep, sacrifice Herald of Torments unless you discard a card or pay 3 life.
6/6