Final confrontation

When this enters play a creature you control fights a creature your opponent controls. If only you survives draw 3 cards, if there are no lands and/or moxes discard them.
Whenever a creature is put into play put a tense counter on this.
{u}{t} Each player gets a 1/1 challenger token which put +1+1 counters on for each tense counter on this.
After another enchantment is put in play transform this.
"Only 2 dare enter the humar fortress"