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Sometimes, two simple cards are enough to bring a big change to a format

What could you give an opponent from their graveyard on their upkeep that could turn the tide of the game

On top of that, it grows with +1/+1 counters whenever any player sacrifices a creature, so it scales fast in sacrifice-heavy games

Either you played it normally or you could have it come into play with a +1/+1 counter and it gained "must attack each turn if able." My one suggestion was to shift the negative from the red "must attack" to the black "can't block." I felt that it would be better flavor, would play better, and would create fewer bad feelings for the players (as a rule, players dislike when their creatures are forced to do dumb things that get them killed)