Trinity jumped above the Tigers to finish in eleventh spot in Super League after a free-flowing game that momentarily allowed Wildcats' fans to forget about their financial difficulties, after new chairman Michael Carter revealed last week the club need to raise £400,000.
"Liam Kay took his tries exceptionally well. During the course of the game I thought we were the team who were consistently making line breaks," said Agar.
"I pay tribute to Ali [Lauitiiti], he came up with a few quality pieces of play and he came up with the kick block on (Rangi) Chase which set up the last-minute try. We can have an off-season of bragging rights.
"We have had a really tough week. We will try and keep a hold of the core group of players. The club has got some important bills and situations over the next two months.
"We probably have to sell at least one more player, maybe even two. We may lose three, four, five or maybe more.
"Danny Kirmond I feel is an untouchable one though. He is a Wakefield kid. The chairman has made it clear that we want him to lead us out in a new stadium."
Despite James Clare's first-half treble and a try from Chase on his Castleford farewell, Trinity were four points up at the break as Tigers-bound Frankie Mariano (twice), Kay and Kyle Trout went in.
Wakefield extended their lead after the break when Kay raced away for his second, but Weller Hauraki crashed over to reduce the gap to two before Clare scored his fourth.
Lauitiiti then levelled it at 32-32 before charging down Chase's kick for glory and sending Kay away for a brilliant finish.
Castleford coach Daryl Powell nonetheless commended Chase on his performance in his last appearance for the Tigers before his move to Salford for 2014, and felt his side deserved a draw.
"I thought we deserved a point today but that's the way it goes. We went after winning the game rather than closing it out," he said.
"It is a little bit of a bitter-sweet finish but I just said to the players it's been a pleasure over the last 13 games.
"The young guys did themselves and the club proud. I've been really pleased with the second half of the season since I've been involved, we've got to build on that now.
"We should have gone to Jordan Tansey for the kick and Rangi was forced into a decision he didn't want to make.
"Rangi is a special player. He's a once-in-a-lifetime sort of player. I haven't seen anybody else do the type of things he's done.
"I think he's really loved being at Castleford and that's good to see. Since I've been at the club he's been nothing but a pleasure to work with and every Castleford fan will say it's been a pleasure to have him at the club."