Ill put some of the highlights in order, then gold, just for people to know what they can expect out of these: Kenrith, the Returned King Akroma's Will Urza, Lord High Artificer Counterspell Cryptic Command Rhystic Study Yawgmoth, Thran Physician Bolas's Citadel K'rrik, Son of Yawgmoth Ragavan, Nimble Pilferer Ancient Copper Dragon Primeval Titan Atraxa, Grand Unifier Tymna the Weaver Isshin, Two Heavens as One Thrasios, Triton Hero #45
It effectively kills off creatures that dont look like the creatures already on the table
Final Thoughts As you can see from this article, there are no shortages green card draw spells
TL;DR: Your deck is simply better for including this card if it can play it
You can play whatever Contraptions you draft or open