Ring of Valkas

Equipped creature has trample. (It can deal excess combat damage to the player or planeswalker it's attacking.)

At the beginning of your upkeep, put a +1/+1 counter on equipped creature if it's green.

Equip (: Attach to target creature you control. Equip only as a sorcery.)

Equipped creature has vigilance. (Attacking doesn't cause it to tap.)

At the beginning of your upkeep, put a +1/+1 counter on equipped creature if it's white.

Equip (: Attach to target creature you control. Equip only as a sorcery.)

: Regenerate equipped creature. (The next time that creature would be destroyed this turn, instead tap it, remove it from combat, and heal all damage on it.)

At the beginning of your upkeep, put a +1/+1 counter on equipped creature if it's black.

Equip (: Attach to target creature you control. Equip only as a sorcery.)

: Equipped creature gains hexproof until end of turn. (It can't be the target of spells or abilities your opponents control.)

At the beginning of your upkeep, put a +1/+1 counter on equipped creature if it's blue.

Equip (: Attach to target creature you control. Equip only as a sorcery.)

Equipped creature gets +3/+3 and has "At the beginning of your end step, tap this creature."

Equipped creature doesn't untap during its controller's untap step.

Equip (: Attach to target creature you control. Equip only as a sorcery.)

At the beginning of combat on your turn, put a charge counter on this Equipment.

Equipped creature gets +1/+1 for each counter on this Equipment.

As long as this Equipment has four or more counters on it, equipped creature has double strike.

Equip—Pay or remove a counter from this Equipment.