Deranged Hermit Dark Ascension Fire Cross — Whenever Seifer

Fire Cross — Whenever Seifer Almasy deals combat damage to a player

Each Magic the Gathering - Aetherdrift Play Booster Pack includes:

All Sliver creatures get +1/+1 for each other Sliver on the battlefield

and Serpents you control can't be blocked except by Krakens

Whenever a nontoken Equipment you control enters

Deranged Hermit Dark Ascension Fire Cross — Whenever SeiferEcho {3}{G}{G} (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.) When this creature enters, create four 1 1 green Squirrel creature tokens. Squirrel creatures get +1 +1.