500 attack increase even if you don’t control other spell/trap card, which can be further increased by 1500 if you have other spell/trap cards, and it’s not limited to a specific monster type/attribute.
Only increases attack and comes with no protection effects.
Needs other spell/trap cards for a significant attack boost.
Maha Vailo can get a big attack increase due its effect. With 1 Mage Power equip alone already makes Maha Vailo at 2550 attack. You can also use Yami Yugi’s skill Power of Dark (skill) to have Yami at the start of the duel, which will increase Maha’s attack by an additional 700 for a total of 3250 attack level 4 monster.
If your deck has plenty of equip cards, you can use Iron Blacksmith Kotetsu for a search to get a specific equip card in your deck. Vylon Ohm lets you re-use your equip cards if they are in your graveyard. Using Mage Power with Spikeshield will increase your monster by an additional +1000 ATK, and a high DEF increase if your monster is switched to defense and attacked.