City of Waterdeep

{t}: Add 5 mana in any combination of
colors to your mana pool
{t}{x}{x}: Create a number of treasure tokens
equal to {x}
{t}{x}{x}: Search your library for a card with
converted Mana Cost of {x} or Less, reveal
it and add it to your hand then shuffle.
If {x} is paid entirely in treasure the card
is directly played to the battlefield instead.