Might of the Meek 
Instant
Target creature gains trample until end of turn. It also gets +1/+0 until end of turn if you control a Mouse.
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Cards that do something similar expected a card that isn't here?
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Charge Through 89%
$0.23#6595
"Target creature gains trample until end of turn."
+1 more matching line
Vigorous Charge 88%
$0.17#27861
"Target creature gains trample until end of turn. Whenever that creature deals combat damage this turn, if this spell was kicked, you gain life equal to that damage."
Barreling Attack 87%
$0.57#28731
"Target creature gains trample until end of turn. When that creature becomes blocked this turn, it gets +1/+1 until end of turn for each creature blocking it."