It has one of the strongest colorless ETB effects in the game, giving you protection the turn you cast it, so you get a nice advantage even if you cast this card in the late game
Murders at Karlov Manor Collector Booster displays contain 12 Murders at Karlov Manor Collector Boosters
Although shield counters are the most common, there are also +1/+1 counters, -1/-1 counters, and feather counters to name a few
It can't cause any abilities to trigger, and no effect will see its result
Instead, you can use Donald to quest for three lore each turn and start leaping at that finish line
However, if you do choose a target, and that target is illegal at the time the spell tries to resolve, the spell won't resolve and none of its effects will happen