Lots of instants mitigates this since you can cast them in response to the trigger, but then you have fewer cards in hand
Hands and a small stone sword appeared on the pawn, and it turned to stab the queen
The card also scales to the late game, when there are more cards in the graveyard to target and more cards in exile with memory counters
It also auto-equips to a creature to get the looting effect going and since the assassin creature type loves hitting stuff for effects, it works all around
In this example, of the 16 rares, 9 appeared on the sheet 8 times and 7 appeared 7 times
The Construct token is a nasty threat, Urza generates a bunch of mana and can be an infinite mana outlet or just a mana sink to keep the gas flowing, and we cant ignore the synergy with Winter Orb