At six mana, the card is an absolute beating when it hits the board
So, Nomads-en-Kor for the ability activation, and a combination of Pearl Medalion, Cloud Key, or Urzas Incubator for cost reduction, and you have a creature able to keep flickering in and out ad nauseum
Fight On
If you're feeling spicy, you could include Leyline of the GuildpactLeyline of the Guildpact so you could win with Coalition VictoryCoalition Victory, which is easily cast from Esper Terra's final chapter
Just to emphasize how annoying Glissa Sunslayer is in combat, youd have to block this with Terastodon and all three Elephant tokens, and youd still lose 15 total power and toughness in the exchange
Counter Blitz (FINAL FANTASY X)