Library/Secret Chamber - Gets Platinum
Turn 3:
Draw Library, Secret Chamber, Overgrown Estate, Hovel, Necropolis
Play Necropolis
Play Secret Chamber (discarding OE & Hovel for $2)
Play Library, drawing 7 Copper
Play 7 Copper, Buy Platinum
Library/Poor House - Gets Platinum
Turn 3:
Draw Library, Poor House, Necropolis, Overgrown Estate, Hovel
Play Necropolis
Play Poor House
Play Library, drawing 5 Copper
Play 5 Copper, buy Platinum
Library/Beggar - Gets Platinum
Turn 3:
Draw Library, Beggar, Necropolis, Copper, Copper
Play Necropolis
Play Library, Drawing 4 Copper
Play Beggar
Play 9 Copper, Buy Platinum
Coppersmith/Beggar - Gets Platinum ($10)
Turn 3:
Draw Coppersmith, Beggar, Necropolis, Copper, Copper
Play Necropolis
Play Beggar
Play Coppersmith
Play 5 Coppers, Buy Platinum
Amongst others...