All-Out Assault {2}{R}{W}{B}
Enchantment
Creatures you control get +1/+1 and have deathtouch.
When this enchantment enters, if it's your main phase, there is an additional combat phase after this phase followed by an additional main phase. When you next attack this turn, untap each creature you control.
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Cards that do something similar expected a card that isn't here?
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Out of Time 87%
$0.27#5939
"When this enchantment enters, untap all creatures, then those creatures phase out until this enchantment leaves the battlefield. Put a time counter on this enchantment for each creature that phased out this way."
Preston Garvey, Minuteman 82%
#12464
"Whenever this card attacks, untap each enchanted permanent you control."
Raph & Leo, Sibling Rivals 82%
$0.74#9787
"Whenever this card attack, if it's the first combat phase of the turn, untap one or two target attacking creatures. After this phase, there is an additional combat phase."