"totally worthless against immortals" - no offense, but this line just makes me think you're stupid. I don't see why you're using it as an argument point when it has no relevance - because every other spell besides SoW also doesn't effect immortals.
I'll try to explain my point better. Say you've got 30 card slots in your deck. Each slot has value. You want to maximize the value of each slot. One thing you want to avoid is having cards in your deck that are useless. This is one of the drawbacks to a CC card such as this. It's prone to being a dead draw. Or a poor draw in this case. When I'm playing in the arena I see immortals about I'd guess every 5th deck. Maybe every 6th. That's a lot of dead draws. Not every creature control card is a dead draw against an immortal deck. Drain life isn't. Firebolt isn't. Lightning isn't. Those spells are useful whether or not you are facing immortals. Whether or not you are facing a creatureless deck. They don't suffer the same amount of dead draws. Furthermore, those spells can often kill an opponent creature outright. Knocking out not only the damage, but, the creature ability. Those are quite useful spells, and you see them in decks a lot as such.
Most of the good creature control cards have one of the following qualities.
- Mass effect - like Plague, Pandemonium, or Rain of Fire.
- Utility on own creatures - Like Gravity Pull, Acceleration, Alfatoxin, etc.
- Can be used on Opponent or Opponent creatures - Like Drain life, Firebolt, Lightning.
- Repeat use - Creature/weapon abilities. (didn't include this category at first because I was only thinking of spells, not creatures/permanents)
This card falls into none of these catagories. Reverse Time is the only card I would consider good control that doesn't fall into any of those catagories, although would could use it on your own creatures to rescue them in a pinch. But, Reverse time is a heck of a lot stronger than this, and cheaper to boot.
This would more closely compare with Basilisk Blood and Freeze. And I think the only reason folks use freeze is because it's so easy to splash into a rainbow deck. You hardly ever see Basilisk Blood in a deck. But, this card compares terribly with Basilisk Blood. And pretty badly with Freeze.
And if you just want a stall, wouldnt' you rather have a Heal or empathic bond 95% of the time?
I'm just not seeing it. I guess we'll just have to agree to disagree.