Umbar Raider gets +1 for each resource on it.

Forced: After Umbar Raider attacks you, move 1 resource from one of your heroes’ resource pools to Umbar Raider.

“And there men of Lamedon contested the fords with fell folk of Umbar and Harad who had sailed up the river.”
–Legolas, The Return of the King

Forced: When Corsair Infiltrator attacks, deal it 1 additional shadow card for each resource on it.

Forced: After the engaged player collects resources at the beginning of the resource phase, that player moves 1 resource from one of his heroes’ pools to Corsair Infiltrator.

Raid Leader gets +1 for each resource on it.

Forced: When Raid Leader engages you, move 1 resource from each of your heroes’ resource pools to Raid Leader.

“The Corsairs are upon us! It is the last stroke of doom!”
–Men of Gondor, The Return of the King

When Revealed: Place 1 resource on each Raider enemy in play. Each engaged non-Ship enemy makes an immediate attack. If there are no engaged non-Ship enemies, Battle-Hardened gains surge.

Shadow: If the attacking enemy is a Raider, place 2 resources on it.