1st off needed siya in every battle in case kulang ka ng pang feed sa kalaban mo pag sneak battles, 0 mana card na depende sa type ng fiend na gamit mo is may corresponding effect sa team mo,in which case a high leveled soulfiend can be your best friend kung gusto mong makalamang sa speed ng kalaban plus on low mana battles can be on front line or backline ihalo mo pa yung equalizer rule kung sakali e dis card is a must have