Destruction by battle is a legit way to net yourself a profit.

[Toffee.]

Forte Underground -LIGHT-
Lvl4
[Insect/Effect]
During the turn this card is Normal Summoned, "Forte" monsters are un-effected by the effect(s) of Trap cards. If this card destroyed an Opponent's Attack Position monster as a result of battle: Inflict 800 damage to your Opponent. If this card is destroyed as a result of battle: Return this card to the bottom of your deck.
1800ATK / 500DEF

Forte Wings -FIRE-
Lvl4
[Dragon/Effect]
As long as this card remains face-up on the field: Increase the ATK of all Attack-Position "Forte" monsters by 500. If a "Forte" monster is switched to Defense Position: Destroy it. If this card is destroyed as a result of battle: Return this card to the bottom of your deck.
1800ATK / 500DEF

Forte Giro -WIND-
Lvl4
[Machine/Effect]
When this card is Normal Summoned: Return 1 "Forte" monster from your hand to the bottom of your deck; Draw 1 card. As long as this card remains face-up on the field, the controller of this card cannot Special Summon, and the Opponent cannot set any monsters. If this card is destroyed as a result of battle: Return this card to the bottom of your deck.
1800ATK / 500DEF

Forte Speed -EARTH-
Lvl4
[Winged Beast/Effect]
Once per turn: Target 1 Face-Down Defense Position monster your Opponent controls; change it to Face-Up Attack Position(FLIP effects are not activated). If you activate this effect, this card cannot attack this turn. If this card destroys an Opponent's Attack Position monster as a result of battle: Draw 1 card. If this card is destroyed as a result of battle: Return this card to the bottom of your deck.
1800ATK / 500DEF

Forte Iron -DARK-
Lvl4
[Rock/Effect]
During the End Phase of each turn, add 1 "Forte" monster from your deck to your hand for each Attack Position monster on the Opponent's side of the field that was destroyed as a result of battle during that turn. If this card is destroyed as a result of battle: Return this card to the bottom of your deck.
1800ATK / 500DEF

Forte Berserk -WATER-
Lvl4
[Fiend/Effect]
This card cannot be Special Summoned. Negate the effect(s) of all Face-Up Attack position monsters that are destroyed as a result of battle from Face-Up Attack Position "Forte" monsters. If this card is destroyed as a result of battle: Return this card to the bottom of your deck.
1800ATK / 500DEF

Forte Magnum -FIRE-
Lvl4
[Thunder/Effect]
If a "Forte" monster battles a Defense Position monster, change that monster to Attack Position. If this card is destroyed as a result of battle: Return this card to the bottom of your deck.
1800ATK / 500DEF

Forte Grave -LIGHT-
Lvl4
[Reptile/Effect]
Face-Up Attack Position "Forte" monsters cannot be destroyed as a result of battle. Decrease the ATK of all Attack Position monsters on the Opponent's side of the field by 200. When this card is removed from the field, Take 1000 damage. If this card is destroyed as a result of battle: Return this card to the bottom of your deck.
1800ATK / 500DEF

Forte Buster -Quick-Play Spell-
Activate if you control a "Forte" monster by targeting a Defense Position monster your Opponent controls: Change it to Face-Up Attack Position and Decrease it's ATK by 1000.

Forte Endurance -Continuous Spell-
Increase the ATK of all Attack Position "Forte" monsters by 200. Decrease the ATK all Attack Position monsters on the Opponent's side of the field by 200.