Scavenging Troupe

Put the top {x} cards from each players library
into their graveyard. You may play those cards
until the end of your next turn and you may
pay mana of any colour to cast those spells , If
you do they cost {1} less to cast for each
card type in all graveyards.
If this spell was Flash-Backed, Instead return a creature card from a graveyard with mana value
five or less to the battlefield under your control.
Flash-Back {2}{b}{b}{g}