Song of the Worldsoul 
Enchantment
$4.38 #5301 0.38 7.2 years
Whenever you cast a spell, populate. (Create a token that's a copy of a creature token you control.)
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Cards similar to Song of the Worldsoul expected a card that isn't here?
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Growing Ranks94%
$0.35↓#46050.14↓14.0 years↑
"At the beginning of your upkeep, populate."
Nesting Dovehawk90%
$23.11↑#3169↑0.393.5 years↓
"At the beginning of combat on your turn, populate."
Wake the Reflections90%
$0.17↓#12604↓0.13↓13.5 years↑
"Populate."
Muster the Departed88%
$0.29↓#60570.11↓2.3 years↓
"At the beginning of your end step, if a creature died this turn, populate."
Coursers' Accord85%
$0.12↓#26078↓0.00↓14.0 years↑
"Create a 3/3 green Centaur creature token, then populate."
Full Flowering84%
$1.85↓#9666↓0.18↓7.2 years
"Populate X times."
Ghired, Conclave Exile84%
$0.28↓#12521↓0.12↓7.2 years
"Whenever this card attacks, populate. The token enters tapped and attacking."
Scion of Vitu-Ghazi84%
$0.21↓#22661↓0.11↓13.5 years↑
"When this creature enters, if you cast it from your hand, create a 1/1 white Bird creature token with flying, then populate."
Wayfaring Temple83%
$0.24↓#11330↓0.13↓14.0 years↑
"Whenever this creature deals combat damage to a player, populate."
Eyes in the Skies82%
$0.10↓#16782↓0.06↓14.0 years↑
"Create a 1/1 white Bird creature token with flying, then populate."
Determined Iteration82%
$0.37↓#3884↑0.19↓4.5 years↓
"At the beginning of combat on your turn, populate. The token created this way gains haste. Sacrifice it at the beginning of the next end step."
Vitu-Ghazi Guildmage82%
$0.21↓#14746↓0.12↓14.0 years↑
"
: Populate."
: Populate."
Horncaller's Chant80%
$0.09↓#24702↓0.24↓14.0 years↑
"Create a 4/4 green Rhino creature token with trample, then populate."
Promise of Aclazotz // Foul Rebirth78%
$0.24↓#7672↓0.12↓2.9 years↓
"At the beginning of your end step, you may sacrifice a non-Demon creature. If you do, populate."
Trostani, Selesnya's Voice78%
$1.35↓#3084↑0.24↓14.0 years↑
"
, 
: Populate."
, : Populate."
Rootborn Defenses77%
$0.16↓#1362↑0.17↓14.0 years↑
"Populate. Creatures you control gain indestructible until end of turn."
Xavier Sal, Infested Captain76%
$1.31↓#9039↓0.06↓2.9 years↓
", Remove a counter from another permanent you control: Populate. Activate only as a sorcery."
, Remove a counter from another permanent you control: Populate. Activate only as a sorcery."
Life Finds a Way76%
$14.74↑#8058↓0.86↑2.9 years↓
"Whenever a nontoken creature you control with power 4 or greater enters, populate."
Arboreal Alliance76%
$0.40↓#12565↓0.363.0 years↓
"Whenever you attack with one or more Elves, populate."
Cayth, Famed Mechanist75%
$0.41↓#44020.10↓2.3 years↓
"• Populate."