I'll put Pentagram on my side deck now and then put as a counter against Swarm Spawn Type Beastmaster, and i think it gives me a good chance of winning! I swarm Fire Brand Imp put a blood reaper on it and then wrest havoc against his smaller creature, my swarm and me can accumulate 2 mana per round which is like +3cha p/r which i think it pays as a compensation from my wasted round without 2 mana accumulated.

Yesterday I won against a SST Beastmaster! One of the key factor is the Pentagram Card, I won without  enchantment and only a Demonhide Armor Equipped, I almost lost that match.. was Tanglevined and has 16/20hp cause i wasted a turn without summoning my 2nd Mana Crystal and his buffed creature owning me, i only had 10ch and he got 13ch but thanks to Pentagram I able to  swarm level 1 Dark Creature and they accumulated enough mana to summon Death Pact Slayer and eventually Flaming Hellion! They own their level 1 Animal Creature and the beastmaster who's trying to kill me, also thanks to Blood Reaper that heals my HP! One of the best Comeback for me as a moment!  :silly:  

By the way.. You can't put a monster face down in your spawnpoint if the Pentagram only has 1 mana? Cause it said that you need 2 mana to summon a Dark monster..