1st edition pokemon cards value Charizard Pewter (tin) Metal Card - Collectible Trading Card 1999 Pokemon Base Set Shadowless

Rule 613.6 explains how timestamps work

Proponents of the Reserved List at the time took this as an affront to the spirit of the agreement, a loophole used to drum up perceived value of a supplementary release, like From the Vault, and syphon some of that profit from selling Reserved List cards

For example, Doom Blade is a great card until the metagame is 90 percent Esper Control and Mono-Black Devotion

Same goes for Dragon's Hoard, which gives you card advantage over time

Multicolor is a combination of two or more colors

They also "remember" who controlled them when they phased out, although they may phase in under the control of a different player if a control effect with limited duration has expired