Who else thinks this is a good idea

[Sparkle Ninja]

I want to make a build around {Hive mind} with all the Pact cards ({Pact of Negation}, {Summoners pact}) so my opponent copies them and loses

[Sparkle Ninja]

That's already a thing, look up Vigor Bloom

Holy crap really?

[Dstyle1]

Or you can play hive mind in legacy

[InfinitiveDivinity]

That's already a thing, look up Vigor Bloom

Or Titan Bloom

[Agrus Kos, Enforcer of Truth]

That's already a thing, look up Vigor Bloom

Or Titan Bloom

Vigor decks are hilarious. RIDICULOUSLY hard to play, but with a few hours of practice and watching the pros, you could learn it.

[Sparkle Ninja]

That's already a thing, look up Vigor Bloom

Or Titan Bloom

Vigor decks are hilarious. RIDICULOUSLY hard to play, but with a few hours of practice and watching the pros, you could learn it.

But that doesn't do what I want. I want them to not be able to pay the upkeep cost of the pact and lose

[Agrus Kos, Enforcer of Truth]

That's already a thing, look up Vigor Bloom

Or Titan Bloom

Vigor decks are hilarious. RIDICULOUSLY hard to play, but with a few hours of practice and watching the pros, you could learn it.

But that doesn't do what I want. I want them to not be able to pay the upkeep cost of the pact and lose

The deck uses that as an alternate win con. Here is an example of a deck list:
1  Boros Garrison
1  Cavern of Souls
1  Forest
3  Gemstone Mine
1  Golgari Rot Farm
3  Gruul Turf
1  Kabira Crossroads
1  Khalni Garden
2  Selesnya Sanctuary
4  Simic Growth Chamber
1  Slayers' Stronghold
1  Sunhome, Fortress of the Legion
3  Tendo Ice Bridge
3  Tolaria West
1  Vesuva
27 lands

3  Azusa, Lost but Seeking
4  Primeval Titan
7 creatures

4  Amulet of Vigor
4  Ancient Stirrings
3  Hive Mind
2  Pact of Negation
4  Serum Visions
1  Slaughter Pact
4  Summer Bloom
4  Summoner's Pact
26 other spells

Sideboard
1  Bojuka Bog
1  Chalice of the Void
1  Choke
3  Creeping Corrosion
1  Engineered Explosives
1  Ghost Quarter
1  Pithing Needle
3  Pyroclasm
2  Seal of Primordium
1  Wurmcoil Engine
15 sideboard cards

[Sparkle Ninja]

I could try that