Actually, it doesn't work at all. When you apply a new instance of the enter-the-battlefield-copy replacement effect, you are overwriting all the characteristics the permanent was previously supposed to have. That's why a Clone that enters the battlefield as a copy of something else is not named Clone.
So you can't get more than one instance of the upkeep triggered ability.
For those wondering about Progenitor Mimic x2 and infinite triggers, it doesn't work. I'll post something to my tumblr eventually.
Now would be a fantastic time to follow me! http://tabakrules.tumblr.com Post will be later tonight though. Meetings in forseeable future.
Nylon is correct. Each time you apply the copy effect, you're overwriting all other copy effects trying to apply at the same time. So the most you'll get is 1 copy of the ability, unless you use another Mimic to copy a Mimic that is already copying something. Then you'll get 2 triggers, etc. Applying the copy effect repeatedly just gets you the same result each time you apply that copy effect: A naked Mimic with a single "copy me at upkeep" each time.
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Originally posted by Charlotte Sable
Why the Progenitor Mimic trick doesn’t work:
So… by now you’ve probably heard of the silly combo, where Anthem effect + “naked” Progenitor Mimic + any clone = zomg, Progenitor Mimic with infi-billion token triggers! adfdsDDAdadsad!!!!`111!!!1~!@!
…except this doesn’t work…
And the reason why is kind of glaringly obviously. I’m quite disappointed in myself for not figuring this one out by myself.
So, we have our 1/1 Mimic that’s not copying anything, and we cast Clone. As Clone starts to resolve, we apply its replacement effect, and choose to have it copy the Mimic, so now it’s a Progenitor Mimic. Cool.
Progenitor Mimic also has a replacement effect, so that let’s us choose to copy something if we want, so we’ll copy Progenitor Mimic!
So now we have a Progenitor Mimic with a token-making trigger. Yay!
That was fun! Let’s have it copy the Mimic again!
So now we have a Progenitor Mimic with a token-making trigger. One. Not two.
Wait… what? But doesn’t the mimic get another token-making trigger? Well, no…. because it’s not copying itself. It’s copying the original Mimic, so we copy that and add a trigger. And that’s all.
That’s the flaw in the original combo. You’re always copying the same Mimic, which isn’t the one that’s about to enter the battlefield, so once you have a Mimic copy a Mimic, the result will always be the same: Progenitor Mimic with one token-making trigger.
So you can't get more than one instance of the upkeep triggered ability.
Nylon is correct. Each time you apply the copy effect, you're overwriting all other copy effects trying to apply at the same time. So the most you'll get is 1 copy of the ability, unless you use another Mimic to copy a Mimic that is already copying something. Then you'll get 2 triggers, etc. Applying the copy effect repeatedly just gets you the same result each time you apply that copy effect: A naked Mimic with a single "copy me at upkeep" each time.
This FAQ answers many of the common questions asked in the MTGS Rulings forum. Take a look!
I'm the editor/content manager of the Magic Rules Tips Blog - Bookmark this site for daily tips about game and tournament rules.
"Abstract concepts of perfect judging run headlong into the realities of how people play the game." - Toby Elliott (papa_funk)
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http://magicjudge.tumblr.com/post/49880206513/why-the-progenitor-mimic-trick-doesnt-work
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Please use card tags when you're asking a question about specific cards: [c]Serra Angel[/c] -> Serra Angel.