Sludge Strider

Whenever another creature you control with power 5 or greater enters, you may return target creature card from your graveyard to your hand.

Flying At the beginning of your upkeep, return an artifact you control to its owner's hand.

Search your library for a Plains card, an Island card, a Swamp card, and a Mountain card. Reveal those cards, put them into your hand, then shuffle.

Domain — Equipped creature gets +1/+1 for each basic land type among lands you control. Equip 3

Flying Exalted (Whenever a creature you control attacks alone, that creature gets +1/+1 until end of turn.)

Flying When this creature enters, you may search your library for an artifact creature card, reveal it, put it into your hand, then shuffle.

Devour 1 (As this creature enters, you may sacrifice any number of creatures. It enters with that many +1/+1 counters on it.) This creature has flying and trample if it devoured a creature.

WUBRG: This creature gets +2/+2 and gains fear until end of turn. Target creature gets -2/-2 until end of turn. Activate only during your turn. (A creature with fear can't be blocked except by artifact creatures and/or black creatures.)