Folie à Deux
Sorcery
Kicker - Discard a card. (You may discard a card in addition to any other costs as you cast this spell.)
Target player discards a card. If Folie à Deux was kicked, that player discards two cards instead.
By the ninth time Urg saw a shadow following them, Arg did too.

Cast into Mist —
Instant
Exile target creature. Its controller gains life equal to its power. At the beginning of the next end step, you may return that card to the battlefield under its owner's control.
"The mists in these mountains mirror the clouds in your mind. Clear your mind, and you will find your way back home."
—Narset

Seismic Swallowing
Sorcery
Destroy target artifact, creature, or land.
The earth's moods are difficult to predict. When it punishes you, you may not know what you did wrong.

Purge the Unworldly
Instant
Destroy target artifact, enchantment, or planeswalker.
"If you wish to exist here, you must be willing to put down roots."

Seismic swallowing could hit walkers too and just say "destroy target nonenchantment permanent"

that's not at all aesthetic

Beset by Weeds
Instant
Destroy target artifact or enchantment. Its owner creates a 1/1 green Saproling creature token.

This is very powerful but might be printable depending on environment. Probably still worse than Nature's Claim because lifegain, lol

Teardown
Instant
Destroy target noncreature artifact or enchantment.

Don't know if this wording applies 'noncreature' to enchantment or not but it doesn't really matter currently

Putrid Patroller
Creature - Zombie Soldier
Putrid Patroller can't block.
He does his duty in death as he did in life. Badly.
2/4

Having a creature that's relatively hard to kill for its cost, but can't block, probably isn't very interesting, but at least it's better than Spineless Thug.

Hell, maybe you could even have

Putrid Patroller 2: Electric Boogaloo
Creature - Zombie Soldier
Indestructible
Putrid Patroller 2 can't block.
He also does his duty in death as he did in life.
2/1

Black has done “recurable creature that can’t block” a bunch of times, so I am kinda surprised they haven’t done the simpler “high toughness creature that can’t block” version.

Aspect of Awe
Creature — Spirit Avatar
Other creatures have base power and toughness 1/1.
1/1

Subvert

Sorcery
Target opponent reveals his or her hand and you choose a nonland card from it. That player discards that card, then draws a card.

Isn't that just Threaten?

it's instant speed
so more like Act of Aggression

Power Word: Kill
Instant
Destroy target creature with toughness 4 or less.

strangling soot is the only other black card that does this but this effect doesn't exist in isolation in black and it feels like it should

Avatar of Death

Creature -- Avatar
*/*
As Avatar of Death enters the battlefield, choose an opponent.
Avatar of Death's power and toughness are each equal to the chosen opponent's life total.

Battle Training

Enchantment
Each creature you control enters the battlefield with a +1/+1 counter on it.

After some (over)development this now has an alternative version of

Less of a candidate for this thread, but I thought to mention it.

... and a reddit thread btw https://www.reddit.com/r/custommagic/co ... lot_twist/

Greed is Good
Enchantment (R)
Whenever a creature you control deals combat damage to an opponent, you draw a card and you lose 1 life.