Notably, none of these abilities come with a once per turn clause, allowing you to keep gaining value and power as long as you have the tokens to spare
Tek gets +0/+2 as long as you control a Plains, has flying as long as you control an Island, gets +2/+0 as long as you control a Swamp, has first strike as long as you control a Mountain, and has trample as long as you control a Forest
On the other hand, thanks to powerful ramp tools like Badgermole Cub, its not unreasonable at all to drop Vibrance for full price on turn three or four
If it's a permanent spell, the copy gains haste and "At the beginning of the end step, sacrifice this permanent." (A copy of a permanent spell becomes a token.) Creature - Beast Demon Riku of Two Reflections Whenever you cast an instant or sorcery spell, you may pay
You can actually choose to pay the kicker cost of two mana, one of which is Black, to allow you to exile any nonland permanent instead