The Name Game (Vol. II)

I overlooked the fact the last copy spell that's a kind of Fork was printed a decade ago.
Indeed, copying opponent's spell is very superior to your one in tempo advantage.
How much do you think is the valid cost for the copy? Clone type effect is almost 4 mana and Sculpting Steel is 3 mana so an instant and sorcery copy that doesn't care who cast it would be 3, I think.
And about life gain, I considered its weakness in early turns and restriction on your deck importantly, but in an appropriate deck it would produce 7 or more life so it is true I undervalued the life gaining.
I think 2GUU would be reasonable now though I feel it is a bit heavy.
Ivy is Ivy, Gleeful Spellthief. Doesn't it make sense yet?

Thanks for the win!
Now let us go out on a limb, and create a card with a name that pertains to one or more appendages of the human body.

An Arm // A Leg (split card, with Obscura watermark)

An Arm
Instant
Put a defender counter on target creature an opponent controls.
"Thank you for lending a hand."
//
A Leg
Instant 
Put a -1/-1 counter on target creature an opponent controls. It can no longer block.
"Your donation keeps our operations running."

Idea - Heads Have Rolled: a neat possible boardwipe, but it is quite inconsistent due to the D8, making its cost and rarity be quite proper. This dice throwing would not work very well for dice-manipulation decks though, as the other players throw their own dice, which doesn't work with things like Krark's Thumb

vizionarius - An Arm and A Leg: A neat opposite effect between arm and leg that makes a nice, flexible, flavorful common. 

ameisenmeister - Go For The Head: The classic Mind Rot that turns into a Hymn to Tourach with the right conditions. I did at first think the title would refer to a kill spell, but this also makes total sense.

The winner is vizionarius for the flavorful limb-splitting split card.

I hope this is ok?

Name your Price!
Scheme
When you set this Scheme in motion, target opponent chooses a number. When they do, choose one —
• That player loses that much life.
• You lose that much life and control that player during their next turn.

Enough!
Instant
Counter target spell.  Its controller cannot cast spells until end of turn.

Feedback

Idea: The card has great overall flavor! Awesome reference in the flavor text. Reminds me of a Norin the Weary effect, but the added doesn't feel off since it's also just an Unsummon.

twintania: Nice!! Taking the prompt to the extreme. The card feels strong, but maybe not too strong? It essentially combines Consider and Strike It Rich (as instant but no flashback). I like it!

Flo00: Whoa! Didn't expect a Scheme, but it works! And that's a strong card! And very flavorful!

moweda: Good name for the ability! There is a card that does this at a cheaper cost (Render Silent), so I think yours at 4 cmc could have an additional effect like scry 2, draw a card, or gain 3 life, etc.

pernicious: I wish it had a bit of a combo/mechanical reference to Ach! Hans, Run! Appropriate name to the effects on the card! It could probably be a 3/2 or 3/3 even and still be an uncommon without it being too strong.

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Winner

Good entries! I'll go with Flo00 as the winner for a card that I can totally hear in Bolas' voice.

Thanks for the win vizionarius!

Next challenge: Make a card with a one-word name that starts with the last letter in your username and ends witht he first letter in your username! You can make up fantasy words.

Ignore numbers. So for me that would be a word starting with o and ending with f.

EDIT: Ignore any non-letter characters. In your username and the card name.

If you're planing on doing somehting in the vein of Celebr-8000 or Kaboom!, that's ok.

Because I know the effect is super long (which pretty much why I made it silver border), here it is in plain text:

Anti
Instant
Choose an instant or sorcery spell or a triggered or activated ability. If its effects would have a player gain life, they lose that much life instead. If they would deal damage to a player or make them lose life, they gain that much life instead. If it would put or remove counters, it does the other instead. If it would make a player draw one or more cards, they discard that many cards instead. If it would make a player discard cards, they draw that many cards instead. If it would return one or more creatures from anywhere to the battlefield or create one or more creature tokens, instead that spell or ability’s controller must sacrifice that many creatures. If it would have a player sacrifice one or more creatures, instead for each one they choose a creature they control and create a copy of it, choosing a different creature each time up to that number. If it would counter a spell instead that spell’s controller creates a copy of that spell.

Note: The challenge says it has to be a one-word name