These duals enter tapped unless you control two or fewer other lands
The most significant difference is that Kicker is an additional cost, while Cleave is an alternative one, like Mutate: if you Cleave Dig Up, you only pay the one generic, two black, and one green, and not the one green in the usual casting cost
For vintage cards, check for three-star rarity symbols, first edition stamps with shadowless text, or promotional event exclusives
A straightforward gameplan lets you focus on learning the nuances of the game and its ruleset without going too deep in complex interactions
obviously a type which takes only 0.5x damage from all other types is better than a type where each types attacks to 2x damage
As long as the base version of the card you have a promo of is legal, then the judge promo version is also legal