Alien Invasion 
Enchantment
$0.26 #20628 0.00 0.2 years
At the beginning of combat on your turn, create a 1/1 red Alien creature token with haste and "This token attacks each combat if able." Put a +1/+1 counter on it for each invasion counter on this enchantment, then put an invasion counter on this enchantment.
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Cards similar to Alien Invasion expected a card that isn't here?
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Assemble the Legion80%
$0.31↑#2202↑0.17↑13.6 years↑
"At the beginning of your upkeep, put a muster counter on this enchantment. Then create a 1/1 red and white Soldier creature token with haste for each muster counter on this enchantment."
Paradox Zone71%
$1.18↑#9925↑0.35↑5.4 years↑
"At the beginning of your end step, double the number of growth counters on this enchantment. Then create a 0/0 green and blue Fractal creature token. Put X +1/+1 counters on it, where X is the number of growth counters on this enchantment."
Hulk, Brutal Brawler70%
$15.40↑#171510.000.2 years
"Whenever this card attacks, put a +1/+1 counter on each other creature you control."