Support Mission 
Enchantment
$0.17 #27766 0.00 0.0 years
Whenever a creature you control enters, put a quest counter on this enchantment. Put a +1/+1 counter on that creature. If this enchantment has five or more quest counters on it, instead put two +1/+1 counters on that creature.
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Cards similar to Support Mission expected a card that isn't here?
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Good-Fortune Unicorn84%
$0.26↑#3560↑0.15↑7.4 years↑
"Whenever another creature you control enters, put a +1/+1 counter on that creature."
Conquest Mission83%
$0.23↑#19555↑0.0 years
"Whenever a nontoken artifact you control enters, put a quest counter on this enchantment. Create a 1/1 colorless Borg artifact creature token. If this enchantment has six or more quest counters on it, create two of those tokens instead."
Juniper Order Ranger82%
$0.15↓#8396↑0.18↑21.2 years↑
"Whenever another creature you control enters, put a +1/+1 counter on that creature and a +1/+1 counter on this creature."
Simic Ascendancy82%
$0.57↑#1328↑0.67↑7.8 years↑
"Whenever one or more +1/+1 counters are put on a creature you control, put that many growth counters on this enchantment."
Airbender Ascension80%
$1.46↑#2192↑0.24↑1.0 years
"Whenever a creature you control enters, put a quest counter on this enchantment."
Celebrity Fencer78%
$0.17#18933↑0.004.5 years↑
"Whenever another creature you control enters, put a +1/+1 counter on this creature."
EPF Point Squad78%
$0.10↓#222930.17↑0.7 years
"Whenever another creature you control enters, put a +1/+1 counter on this creature."
Quest for the Gemblades76%
$0.19↑#264120.12↑17.1 years↑
"Whenever a creature you control deals combat damage to a creature, you may put a quest counter on this enchantment."
Political Triumph76%
$0.30↑#12712↑0.14↑0.4 years
"Whenever a creature you control enters, scry 1 and put a plan counter on this enchantment."
Mabel, Valley Hero75%
$0.23↑#19311↑0.090.1 years
"Whenever this card or another creature you control enters, put a +1/+1 counter on target creature that entered this turn."
Durable Handicraft74%
$0.08↓#20721↑0.0710.1 years↑
"Whenever a creature you control enters, you may pay 
. If you do, put a +1/+1 counter on that creature."
. If you do, put a +1/+1 counter on that creature."
Emiel the Blessed74%
$6.71↑#2718↑0.51↑6.3 years↑
"Whenever another creature you control enters, you may pay 
. If you do, put a +1/+1 counter on it. If it's a Unicorn, put two +1/+1 counters on it instead."
. If you do, put a +1/+1 counter on it. If it's a Unicorn, put two +1/+1 counters on it instead."
Sunspring Expedition74%
$0.09↓#18820↑0.0017.1 years↑
"Whenever a land you control enters, you may put a quest counter on this enchantment."
Ior Ruin Expedition74%
$0.15↓#15301↑0.0017.1 years↑
"Whenever a land you control enters, you may put a quest counter on this enchantment."
Mighty Mutanimals73%
$0.22↑#16187↑0.26↑0.7 years
"Whenever another creature you control enters, put a +1/+1 counter on target creature you control."
Deanna Troi, Psychic Counsel72%
$0.38↑#245950.0 years
"Other creatures you control enter with an additional +1/+1 counter on them."
Quest for the Goblin Lord72%
$0.94↑#7627↑0.0016.8 years↑
"Whenever a Goblin you control enters, you may put a quest counter on this enchantment."
Sigil Captain72%
$0.24↑#18844↑0.0017.5 years↑
"Whenever a creature you control enters, if that creature is 1/1, put two +1/+1 counters on it."
Renata, Called to the Hunt72%
$0.20↑#3050↑0.14↑6.8 years↑
"Each other creature you control enters with an additional +1/+1 counter on it."
Serra Redeemer72%
$0.26↑#9198↑0.004.2 years↑
"Whenever another creature you control with power 2 or less enters, put two +1/+1 counters on that creature."