Only talking about upped versions of any card mentioned
Pulverizer (upped)
Card Cost: 4

Skill Cost: 2

Damage: 5
Pros:
As long as it is a weapon, only permanent control can get to it (which is only deflag, steal, another pulvy, or a butterfly effect creature)
Cant be stopped by sundials
Only Card Necessary to play
Still useful in mono earth decks due to its 5 damage
1 card combination
Protect artifact will make it invulnerable for just 1

Cons
Can only have 1 out at a time unless used with animate
When animated is possible to be targeted with a larger variety of cards
Cant use any other weapons with it
Cant use ability in mono earth deck
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Butterfly Effect (upped)
Card Cost: 7

Skill Cost: 3

Pros
Gives mono entropy permanent control
Gives Permanent control to decks that use

(cant really think of anything else)
Cons
Creature can be loboed, devoured, RoF, Lightning, congealed (list goes on and on)
Removes pre-existing ability
Can only be used on a creature with less than 3 Atk (in mono entropy that is only micro abomination)
Needs 2 cards (this and a monster) to be used
To make invincible, You need quintessence 3

(a 3 card combo)
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Definitly needs to be buffed a little... too high cost.