Enchant artifact or creature
As long as enchanted permanent is a creature, it gets -1/-1 and can't block.
Enchanted permanent has "At the beginning of your upkeep, you lose 1 life."
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Hidetsugu, Devouring ChaosNeon Red429 · rare$513.63
Hidetsugu, Devouring ChaosNeon Green430 · rare$108.48
Boseiju, Who EnduresBorderless412 · rare$63.36
Boseiju, Who EnduresExtended Art501 · rare$55.62
Boseiju, Who Endures266 · rare$47.21
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Hidetsugu, Devouring ChaosNeon Blue431 · rare$39.02
Otawara, Soaring CityBorderless414 · rare$38.37
Hidetsugu, Devouring ChaosNeon Yellow · WPN Exclusive432 · rare$35.37
Otawara, Soaring CityExtended Art503 · rare$34.06
Otawara, Soaring City271 · rare$27.23
The Wandering EmperorShowcase316 · mythic$26.87