Card of the Week Contest #246: Swapsies

Graveswapper
Creature — Human Wizard
Deathtouch
At the beginning of your upkeep, you may have two target players exchange graveyards.
"Now, let's see if your backyard has better pickings."
2/5

Seems like that might make sense. I'll take a look when I get home.

Mahx Michael: "Switch" is used exclusively to swap power and toughness on a single creature. Power and toughness is either switched or it isn't, it doesn't represent a permanent exchange of the values, just that they should be swapped after all other p/t calculations are done. "Exchange" can mean a few different things: it can be used to exchange control of two objects (spells aswell as permanents, see Perplexing Chimera), it can exchange cards in zones other than the battlefield/stack, and it can exchange two values, usually life totals but sometimes power/toughness aswell. Unlike with switch, if you exchange a power/toughness value this way, it becomes the new base power/toughness.

("Swap" isn't used, but there is the single future sight card with "Aura swap", which is actually "exchange". It is as far as I know the only card that can swap a card with a permanent. I wouldn't lean too hard on this one.)

For your card, for the first mode I take it that two creatures swap powers with each and swap toughness with each other? (I find it a little hard to follow as written.) In which case you'd use exchange, as with Serene Master. I'm not sure there's precedence for the second mode but since it's not a p/t switch, use exchange there aswell.

Sylvan Trap
Instant - Trap
If a player didn’t lose unspent mana as steps and phases ended this turn, you may pay instead of ~’s mana cost.
Exchange two target player’s mana.  That mana becomes colorless.

Thought I’d go big and outside of the box for this one.  Not always the best idea but thought to make a green card that exchanges instead of //Land

Now, the problem(s):
-Can you exchange mana like this?  I’d say yes,  because exchanging life totals is a thing and it’s  similar- you gain or lose mana/life.
-Should this be a trap?  It’s such a niche, one-time use I figured why the Hell not, right?

Also apparently this is how things are worded since the “mana pool” was phased out.

I've edited my post to show the text and the changes, but in the interest of making sure the changes solved my original issue, here's what the card looks like now:

Greed's Command   
Instant                        
Until end of turn, if a spell cast this
turn would have you exchange
control of a permanent, gain control
of target non-land permanent an
opponent controls instead.
Draw three cards. You lose 2 life.

Lore sidenote: I gave the card the Dimir watermark not just because it's Blue-Black, but because I could see this sort of spell existing in their arsenal. They're more about control through evasion and illusion, but in the event that mind control was used against them, I feel they'd be ready to defend against it and turn it to their advantage.

Trade off 1BU
Instant
Choose target permanent an opponent controls, then that player chooses a permanent you control, exchange control of them, any opponent may pay 1 to repeat this process, except they choose first.

wip, unsure on costs. will prob change art as well

Attachment Deleted
Rhox Safeguard
Creature- Rhino Soldier
Defender
: Target creature you control with defender loses defender until end of turn.
: Switch the power and toughness of target creature you control until end of turn.
3/4
Of all Bant nations, the guardians of Eos command the highest respect.

"Switch target creature you control's power and toughness until end of turn" looked wrong