You can't have it all
I'm not aware of anything that increases your attack ability or damage or durability, or can spread in an amorphous cloud.
As far as "attacking people near you with bloodlust" (or something similar)...
Confusion or Possession seems your best bet.
There are a few ways to do these with spells and monsters (which can have spells).
I should start off with "confusion", the spell. Roll a d10 and get an effect:
1 The creature uses all its movement to move in a random direction. To determine the direction, roll a d8 and assign a direction to each die face. The creature doesn't take an action this turn.
2-6 The creature doesn't move or take actions this turn.
7-8 The creature uses its action to make a melee attack against a randomly determined creature within its reach. If there is no creature within its reach, the creature does nothing this turn.
9-10 The creature can act and move normally.
Everyone's "favorite" terrifying pile of mouths, The Gibbering Mouther.
Their general sound is enough to cause a confusion like effect:
...[snip]Roll a d8...[snip]...
1 to 4, the creature does nothing.
5 or 6, the creature takes no action or bonus action and uses all its movement to move in a randomly determined direction.
7 or 8, the creature makes a melee attack against a randomly determined creature within its reach or does nothing if it can't make such an attack.
And I think the best option here is Crown of Madness
...[snip]The charmed target must use its action before moving on each of its turns to make a melee attack against a creature other than itself that you mentally choose.[snip]...
Possession and Charming (remote possession, in my opinion)
Your options here are more limited, but are monsters.
Ghosts(obviously), as well as Yakfolk from Storm King's Thunder can inhabit a body and control it.
Neogi and Succubus (Succubi?) have charm effects that allow them to exert control over an individual. "you. attack them", for example.
Honorable Mention: Berserker Axe
A really classic cursed item that has (in addition to other things) the quality that:
...[snip]Whenever a hostile creature damages you while the axe is in your possession, you must succeed on a DC 15 Wisdom saving throw or go berserk. While berserk, you must use your action each round to attack the creature nearest to you with the axe[snip]...