Break of Day {1}{W}
Instant
Creatures you control get +1/+1 until end of turn.
Fateful hour — If you have 5 or less life, those creatures gain indestructible until end of turn. (Damage and effects that say "destroy" don't destroy them.)
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Cards that do something similar expected a card that isn't here?
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Faith's Shield 82%
$0.25#14563
"If you have 5 or less life, instead you and each permanent you control gain protection from the color of your choice until end of turn."
Opal Avenger 81%
$0.39#31287
"When you have 10 or less life, if this permanent is an enchantment, it becomes a 3/5 Soldier creature."
Gather the Townsfolk 80%
$0.17#11823
"If you have 5 or less life, create five of those tokens instead."
The Shattered States Era // Nameless Conqueror 100%
$0.14#15816
"Creatures you control get +1/+0 until end of turn."