Ok, there must be more we can do with soulbond. I think that mechanic is super cool.
Blinking Familiar
Creature - Spirit
Flying, vigilance
Soulbond (You may pair this creature with another unpaired creature when either enters the battlefield. They remain paired for as long as you control both of them.)
As long as Inspiring Familiar is paired with another creature, each of thos creatures creatures has "When this creature dies, you may return it to your hand."
2/2
Inspiring Familiar
Creature - Bird
Flying
Soulbond (You may pair this creature with another unpaired creature when either enters the battlefield. They remain paired for as long as you control both of them.)
As long as Inspiring Familiar is paired with another creature, each of thos creatures creatures has "When this creature dies, you may draw a card."
1/1
Rotting Familiar
Creature - Zombie Rat
Intimidate
Soulbond (You may pair this creature with another unpaired creature when either enters the battlefield. They remain paired for as long as you control both of them.)
As long as Virulent Familiar is paired with another creature, each of thos creatures creatures has "When this creature dies, target player discards a card."
2/1
Destructive Familiar
Creature - Elemental
Haste
Soulbond (You may pair this creature with another unpaired creature when either enters the battlefield. They remain paired for as long as you control both of them.)
As long as Virulent Familiar is paired with another creature, each of thos creatures creatures has "When this creature dies, target player sacrifices an artifact or land."
3/1
Viridian Familiar
Creature - Elemental
Soulbond (You may pair this creature with another unpaired creature when either enters the battlefield. They remain paired for as long as you control both of them.)
As long as Viridian Familiar is paired with another creature, each of thos creatures creatures has "When this creature dies, you may search your library for a basic land card, put it onto the battlefield tapped, then shuffle your library."
2/1
I don't know if Destructive Familiar is fun, it looks pretty nasty, but I think it's appropriately costed.