It doesnt even want to hang around the field necessarily since its second ability sacrifices it to exile a card from a graveyard
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You only get to do this two times, then it defaults to a generic 6/5 creature with trample, but you're either going to get two free spells, or you're putting pressure on your opponents to remove a potentially game-ending problem
Number Four I feel like all four of these could be #1
Its a bad card by todays standards, so play it if you need to discard cards for madness or reanimator
Changeling Outcast and Mothdust Changeling are primarily freerunning enablers, but a handful of your other cards benefit from assassins dealing combat damage