Forced Adaptation and Ring of Kalonia, for example, are relevant card types that also put +1/+1 counters on Kosei
Old Gnawbone and Tiamat lead the brood, but Circle of Dreams Druid is an explosive mana dork, The Book of Exalted Deeds pumps out angels and can save you from imminent death, Teleportation Circle is a blink staple and then I get into other great cards like Lolth, Spider Queen, Xorn, Delina, Wild Mage, and Fighter Class, cards I run in a few decks each
Cloud, Midgar Mercenary is synonymous with FFVII, and not including him in this form would be a real bummer
Do the first for someone mana screwed to help them out (there is always someone) and then the last two to folks breaking an artifact like Skullclamp or Mind's Eye and then punish the other for holding a full grip
The rulebook included here is also a great resource, and is one of the clearest presentations of the rules I've ever seen