You know, you can always Mirrirweave on your opponent's turn so your triggers will resolve first. Still dangerous if they have 4+ creatures and enough removal to take you down below 4, but potentially faster... and much more exciting.
I am both selfish and instinctive. I value growth and community, as long as they favour my own objectives; I enjoy nature, and I particularly enjoy watching parts of nature die. At best, I am resilient and tenacious; at worst, I'm uncontrollable and destructive.
1 x Cackling Counterpart 1 x Clone 1 x Evil Twin 1 x Infinite Reflection All of these cards can copy him. Cackling counterpart makes two of him, clone, evil twin and infinite relection copy all of the beasties running the format right now (Angel of Serenity and Thragatusk being the best guys running around are both great to copy. Imagine Infinite reflection on Thragatusk! Cloning Angel of Serenity? Epic.)and the deck would be able to mirror match against any creature deck.
Mirrorweave could lose you the game, but you could choose to have yours trigger before the opponents so they fact they were about to win didn't matter, unless they reduce the number of Biovisionaries you ahve to less tahn three while having four creatures open, which seems a justifiable risk.
No, your opponent will win. You Biovisionaries will trigger, then your opponent's creatures will trigger. Theirs resolves first.
Someone correct me if I'm wrong, please.
You cast Mirrorweave on your opponent's turn. Each of you ends up with at least four Biovisionaries . Game progresses to the end step. Triggered abilities that trigger "at the beginning of the end step" or any specific time trigger simultaneously for all players, and this will include a trigger from EACH card named Biovisionary . The active player, being whose turn it is in this case, then gains priority and begins putting his abilities on the stack; then the inactive player (which would be YOU), gains priority and puts his abilties on the stack. If both players then pass priority, the top triggered ability on the stack resolves, and in this case the inactive player (YOU), wins.
If you 'Weave Biovisionary on your OWN turn, your opponent wins, instead.
"Possibilities abound, too numerous to count."
"Innocent, unbiased observation is a myth." --- P.B. Medawar (1969)
"Ever since man first left his cave and met a stranger with a different language and a new way of looking at things, the human race has had a dream: to kill him, so we don't have to learn his language or his new way of looking at things." --- Zapp Brannigan (Beast With a Billion Backs)
Mostly correct, except this bit: "The active player, being whose turn it is in this case, then gains priority and begins putting his abilities on the stack; then the inactive player (which would be YOU), gains priority and puts his abilties on the stack."
Which should be more like: The active player's triggers are put on the stack, then the other player's triggers are put on the stack, THEN the active player gets priority.
But again, there's a lot of risk involved in that you have to maintain control of at least four Biovisionaries before the trigger resolves. If you're running something like Infinite Reflection at least all that happens is you don't win. If you're running Mirrorweave then you LOSE.
Again, higher risk, but it's an Instant which gives you more activation leeway.