Ajani's Last Stand did not interact w/ Undercity Plunder
Opp. played Undercity Plunder (the Alchemy card), to which I first discarded Ajani's Last Stand, then a basic land to the second part of Plunder's rules text.
Ajani's Last Stand's effect when forcibly discarded by an opponent's spell or ability did not go onto the stack and nothing happened.
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Tlaloc#82099
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