Conquer was simple, just a straight up, You control enchanted land, where as Orcish Squatters, if played at the right time, could allow you to steal all of your opponents land, one by one
Before Kaito even gets ramped up, his lower-level effects are still useful to add tokens the player's side of the board
Legality depends on the tournament format -- Trading Post can be legal in some formats and banned or restricted in others
While a bit of a borderline case with both of these cards being pretty playable I would say that Unsummon and Repulse are a reasonable example of this issue, Twitch and Twiddle would perhaps be a better example
But, in the end, a combination of a desire to make the card cooler and give it a needed power boost changed the activation