Prince Renynn

At the moment this summoner is the most expensive summoner on the market. Though l don't think that it's worth to buy this card at such expensive price this summoner will make your monsters too powerful especially monsters with healing ability. For example Flesh Golem has 11 health and if you use this summoner then he'll have 13 health which makes him almost immortal if you use tank healers. Also Prince Renynn increases 1+ range of all range monsters which is another great advantage. The cheapest and riskiest way to get this card is buying beta booster packs and if you don't want to buy booster packs then it would be good to wait for discount.