Kate Stewart {1}{U}{R}{W}
Legendary Creature — Human Scientist
Whenever you put one or more time counters on a permanent you control, create a 1/1 white Soldier creature token.
Whenever Kate Stewart attacks, you may pay {8}. If you do, attacking creatures get +X/+X until end of turn, where X is the number of time counters among permanents you control.
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Cards that do something similar expected a card that isn't here?
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Alistair, the Brigadier 92%
$0.28#11886
"Whenever this card attacks, you may pay {8}. If you do, creatures you control get +X/+X until end of turn, where X is the number of historic permanents you control."
+1 more matching line
Benalish Commander 87%
$0.24#15639
"Whenever a time counter is removed from this card while it's exiled, create a 1/1 white Soldier creature token."