As soon as seven types of land are under your control, you can start building a zombie army, all while blocking with your chunky commander their numerous plant buddies
If it is also a Normal or Effect Monster, it can also be Normal Summoned/Set from the hand, just like any other Normal or Effect Monster
You can only activate 1 "Trap Trick" per turn.
(You may cast cards from your graveyard for their escape cost.) At the beginning of the end step, sacrifice this enchantment
Speaking of which, Slifer should also have its own Continuous Spell that grants its controller an infinite hand size and forces them to draw each time a monster is Special Summoned from a Graveyard
For example, your opponent attacks with [c]Sanguine Guard[/c] and you block with [c]Generous Patron[/c]