Grim Reaper's Sprint 

Enchantment — Aura
$1.68 #4571 0.21 2.5 years
Morbid — This spell costs
less to cast if a creature died this turn.
Enchant creature
When this Aura enters, untap each creature you control. If it's your main phase, there is an additional combat phase after this phase.
Enchanted creature gets +2/+2 and has haste.
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Cards similar to Grim Reaper's Sprint expected a card that isn't here?
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Bone Picker88%
$0.11↓#18064↓0.00↓9.4 years↑
"This spell costs
less to cast if a creature died this turn."
Dreaded Bat-Cloud88%
$0.22↓#22776↓0.00↓0.1 years↓
"This spell costs
less to cast if a creature died this turn."
Aggravated Assault86%
$24.02↑#695↑1.00↑23.9 years↑
"

: Untap all creatures you control. After this main phase, there is an additional combat phase followed by an additional main phase. Activate only as a sorcery."
Port Razer84%
$1.40↓#1929↑0.55↑5.8 years↑
"Whenever this creature deals combat damage to a player, untap each creature you control. After this phase, there is an additional combat phase."
Village Bell-Ringer84%
$0.20↓#3631↑0.40↑14.9 years↑
"When this creature enters, untap all creatures you control."
Aurelia, the Warleader82%
$3.07↑#822↑0.67↑13.6 years↑
"Whenever this card attacks for the first time each turn, untap all creatures you control. After this phase, there is an additional combat phase."
Savage Beating82%
$9.12↑#2931↑0.49↑22.6 years↑
"• Untap all creatures you control. After this phase, there is an additional combat phase."
All-Out Assault82%
$2.32↑#36590.32↑1.4 years↓
"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."
World at War81%
$10.31↑#3272↑0.62↑16.4 years↑
"After the second main phase this turn, there's an additional combat phase followed by an additional main phase. At the beginning of that combat, untap all creatures that attacked this turn."
Full Throttle80%
$4.93↑#1376↑0.49↑1.6 years
"After this main phase, there are two additional combat phases."
Drumbellower80%
$2.65↑#1921↑0.69↑4.5 years↑
"Untap all creatures you control during each other player's untap step."
Purple Worm80%
$0.13↓#20832↓0.125.1 years↑
"This spell costs
less to cast if a creature died this turn."
Relentless Assault78%
$2.19↑#1556↑0.51↑29.6 years↑
"Untap all creatures that attacked this turn. After this main phase, there is an additional combat phase followed by an additional main phase."
Moraug, Fury of Akoum78%
$2.17↑#986↑0.78↑5.9 years↑
"Whenever a land you control enters, if it's your main phase, there's an additional combat phase after this phase. At the beginning of that combat, untap all creatures you control."
Death-Rattle Oni77%
$0.15↓#17588↓0.07↓3.3 years
"This spell costs
less to cast for each creature that died this turn."
Diregraf Rebirth77%
$0.22↓#12825↓0.294.9 years↑
"This spell costs
less to cast for each creature that died this turn."
Seize the Day77%
$2.03↑#1618↑0.50↑24.9 years↑
"Untap target creature. After this main phase, there is an additional combat phase followed by an additional main phase."