As they are they are a 4-cost 5/5 with only one coloured mana required. That is great cost efficiency and great mana cost in a two-colour deck. They can act as a perfectly functional threat-based defender, keeping anything large and valuable from wanting to attack and get traded against a cheaper card. They can't be removed by the enemy champion alone, which makes them a flat necessity as things currently stand(They are the ONLY creature we have that can't be shut down by 3 direct damage.). 5 damage is a big deal, even if we do have to recast it, I am far more worried about it dying than getting sent to hand by a 0/1 token. No, it is not a miracle of beat-down that will blast a 5-damage hole in their defences every turn with impunity, but it is the only thing that can stand between us and their champion picking us apart piece by piece. Getting chump-blocked still costs them a creature, requires that they actually have a spare chump to block with, and is, quite frankly, not a bad price for nibbling at their chumps while simultaneously telling them that if they send over a 5 toughness critter we can take it down, and that we can soak 4 points of trample without feeling it.
But all that needs to be said is that it is the only creature in our deck that can stand up to Aki. The literal only one. We have no choice here.
Not to mention Combo potential. It'd be pretty easy to whip up a red card with "Target creature gainst +4+0 and trample but is destroyed at end of turn."...