Fist of Athena

While you have a Digimon with [Knightmon] in its text, you can ignore this card's color requirements.
[Main] Until the end of opponent's turn, 1 of your their Digimon gains "[Start of Your Main Phase] This Digimon attacks." Then, place this card in the battle area.
[All Turns] When attack target changes, ＜Delay＞ (By trashing this card after the placing turn, activate the effect below.)
・1 of your Digimon gains ＜Piercing＞ (When this Digimon attacks and deletes an opponent's Digimon and survives the battle, it performs any security checks it normally would.) and ＜Security A. +1＞ (This Digimon checks 1 additional security card.) until the end of your turn.

Security Effect [Security] You may play 1 level 5 or lower Digimon card with [Knightmon] in its text from your trash without paying the cost. Then, place this card in the battle area.