I tried out Card not found in Standard, but it didnt work out, because removal was so omnipresent at the time and it dies to pretty much anything
You can cleave it as an alternate cost, and then you net a free spell for the turn, and I love it on an enemy's turn when you cast this for free, to bounce what your foe played and then drop a flash thing like Hullbreaker Horror or Ancient Stone Idol or you can just cast another instant that draws you cards
I came joint second/third place in a group of four
Mana curve, color distribution, probability calculations, format legality checks
Additionally, the fact that Ancient Stone Idol leaves behind a 6/12 token with trample even if dies gives you a little bit of an insurance policy against opposing removal