We wouldnt ask ourselves these questions if Lightning Bolt wasnt one of the defining cards of the entire game of Magic
He could attack, block, had evasion, couldn't be killed, and after the Sixth Edition rules changes could attack, kill and live, and block, kill and live
They scale well, provide card advantage, and snowball effectively
This is a decently sized creature with flash, and you can cast it for free while fulfilling all the roles you want from this effect
Casting Cost: Card Text: Bloodthirst 3 (If an opponent was dealt damage this turn, this creature enters the battlefield with three +1/+1 counters on it.) Trample (If this creature would assign enough damage to its blockers to destroy them, you may have it assign the rest of its damage to defending player or planeswalker.) You might also be interested in these products
Raul, Trouble Shooter is a great pickup for all manner of decks that want to be dipping into the graveyard