I wouldn't be worried about power level. Its really difficult to make a defensive combat trick too good. I can't think of any deck in any format that actually plays instant/sorcery spells that have -K/-0 effects. At worst, you will have to increase rarity to uncommon for it to be printable
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Every time I read a comment about "Well if this card had card draw/trample/haste/indestructible/hexproof/life gain...", I think "You're missing the point." They're armchair developer comments that fail to take into account the card's role in the greater Limited and Standard environment. No, it may not be as good as whatever card you're comparing it to. There's a reason for that. Not every burn spell is Lightning Bolt, nor does it need to be or should be.
- Manite
It's costed slightly more aggressively than this type of effect usually is, but it won't do anything except maybe be good in standard (and C+ through B in limited, depending on the format).
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I primarily play limited, so most of my spoiler season comments view cards through that lens.
http://www.mtgsalvation.com/forums/magic-fundamentals/the-rumor-mill/678986-tumblr-previews-daring-sleuth-jaces-scrutiny?comment=29
NAME - 1U
Instant
Target creature gets -4/-0 until end of turn.
Draw a card.
It doesn't look ridiculously overpowered to me. I figured I'd ask here, since you guys are smart at this kinda stuff! Thanks
.
- Manite
Servien
Chaos' Realm
Escalation of Chaos
Tales of Cahdaria
Enigmatic Distrubance
Celestial Unveiling
Interested in Custom Card Creation.
My Cube:Cardinal Custom Cube
A custom version of a third modern masters: MM2019
(filter->rarity to see in set rarity).