Even for cards like Dragons Approach, where you can have unlimited copies in a deck, you can have up to four copies but it then becomes an infinite card
If, during a player's declare attackers step, a creature that player controls that's been goaded is tapped, is affected by a spell or ability that says it can't attack, or hasn't been under that player's control continuously since the turn began (and doesn't have haste), then it doesn't attack
Check out the slate of panels touching on all things Magic
The OG for this kind of deck is Phelddagrif but commanders like Kynaios and Tiro of Meletis and Kenrith, the Returned King are also popular in this space
He also lets you take control of another creature on the battlefield when he enters, which you control for as long as you control Silumgar
That leaves one simple solution: combo