I always liked
Defense of the Heart
It's a very fair cheatercard which is much less fragile. The opponent can choose to not play a creature or the opponent can choose to attack badly.
Not being blockable is a cheap shot. The question was which worst creature can beat the current one.
In my book this means kills it in combat (over multiple turns) or having an ability which kills it.
ramosian commander
To avoid boring infinite circles.... my opponent also does not like when I do infinite shenanigans in a game... it's like playing with yourself, boring for the other.